diff --git a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/controller/admin/group/ImGroupController.java b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/controller/admin/group/ImGroupController.java
index 7063f6b..16605c6 100644
--- a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/controller/admin/group/ImGroupController.java
+++ b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/controller/admin/group/ImGroupController.java
@@ -1,17 +1,25 @@
 package cn.iocoder.yudao.module.im.controller.admin.group;
 
+import cn.hutool.core.collection.CollUtil;
 import cn.iocoder.yudao.framework.common.pojo.CommonResult;
+import cn.iocoder.yudao.framework.common.util.collection.CollectionUtils;
 import cn.iocoder.yudao.framework.common.util.object.BeanUtils;
 import cn.iocoder.yudao.module.im.controller.admin.group.vo.ImGroupAdminAddReqVO;
 import cn.iocoder.yudao.module.im.controller.admin.group.vo.ImGroupAdminRemoveReqVO;
 import cn.iocoder.yudao.module.im.controller.admin.group.vo.ImGroupCreateReqVO;
+import cn.iocoder.yudao.module.im.controller.admin.group.vo.ImGroupMessagePinReqVO;
 import cn.iocoder.yudao.module.im.controller.admin.group.vo.ImGroupRespVO;
 import cn.iocoder.yudao.module.im.controller.admin.group.vo.ImGroupTransferOwnerReqVO;
 import cn.iocoder.yudao.module.im.controller.admin.group.vo.ImGroupUpdateReqVO;
 import cn.iocoder.yudao.module.im.controller.admin.group.vo.member.ImGroupMemberInviteReqVO;
 import cn.iocoder.yudao.module.im.controller.admin.group.vo.member.ImGroupMemberRemoveReqVO;
+import cn.iocoder.yudao.module.im.controller.admin.message.vo.group.ImGroupMessageRespVO;
 import cn.iocoder.yudao.module.im.dal.dataobject.group.ImGroupDO;
+import cn.iocoder.yudao.module.im.dal.dataobject.group.ImGroupMemberDO;
+import cn.iocoder.yudao.module.im.dal.dataobject.message.ImGroupMessageDO;
+import cn.iocoder.yudao.module.im.service.group.ImGroupMemberService;
 import cn.iocoder.yudao.module.im.service.group.ImGroupService;
+import cn.iocoder.yudao.module.im.service.message.ImGroupMessageService;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.annotations.Parameter;
 import io.swagger.v3.oas.annotations.tags.Tag;
@@ -20,9 +28,17 @@ import jakarta.validation.Valid;
 import org.springframework.validation.annotation.Validated;
 import org.springframework.web.bind.annotation.*;
 
+import java.util.Collections;
 import java.util.List;
+import java.util.Map;
+import java.util.Objects;
+import java.util.Set;
+import java.util.stream.Collectors;
+import java.util.stream.Stream;
 
 import static cn.iocoder.yudao.framework.common.pojo.CommonResult.success;
+import static cn.iocoder.yudao.framework.common.util.collection.CollectionUtils.convertSet;
+import static cn.iocoder.yudao.framework.common.util.collection.CollectionUtils.convertSetByFlatMap;
 import static cn.iocoder.yudao.framework.web.core.util.WebFrameworkUtils.getLoginUserId;
 
 @Tag(name = "管理后台 - 群")
@@ -33,6 +49,10 @@ public class ImGroupController {
 
     @Resource
     private ImGroupService groupService;
+    @Resource
+    private ImGroupMemberService groupMemberService;
+    @Resource
+    private ImGroupMessageService groupMessageService;
 
     // ==================== 群的写操作 ====================
 
@@ -40,6 +60,7 @@ public class ImGroupController {
     @Operation(summary = "创建群")
     public CommonResult<ImGroupRespVO> createGroup(@Valid @RequestBody ImGroupCreateReqVO createReqVO) {
         ImGroupDO group = groupService.createGroup(createReqVO, getLoginUserId());
+        // 新建群必无 pinnedMessages，跳过关联回填
         return success(BeanUtils.toBean(group, ImGroupRespVO.class));
     }
 
@@ -47,7 +68,7 @@ public class ImGroupController {
     @Operation(summary = "更新群")
     public CommonResult<ImGroupRespVO> updateGroup(@Valid @RequestBody ImGroupUpdateReqVO updateReqVO) {
         ImGroupDO group = groupService.updateGroup(updateReqVO, getLoginUserId());
-        return success(BeanUtils.toBean(group, ImGroupRespVO.class));
+        return success(buildGroupRespVO(group, getLoginUserId()));
     }
 
     @DeleteMapping("/dissolve")
@@ -65,14 +86,15 @@ public class ImGroupController {
     @Parameter(name = "id", description = "编号", required = true, example = "1024")
     public CommonResult<ImGroupRespVO> getGroup(@RequestParam("id") Long id) {
         ImGroupDO group = groupService.getGroup(id);
-        return success(BeanUtils.toBean(group, ImGroupRespVO.class));
+        return success(buildGroupRespVO(group, getLoginUserId()));
     }
 
     @GetMapping("/list")
     @Operation(summary = "获得当前登录用户的群列表")
     public CommonResult<List<ImGroupRespVO>> getMyGroupList() {
-        List<ImGroupDO> groups = groupService.getMyGroupList(getLoginUserId());
-        return success(BeanUtils.toBean(groups, ImGroupRespVO.class));
+        Long loginUserId = getLoginUserId();
+        List<ImGroupDO> groups = groupService.getMyGroupList(loginUserId);
+        return success(buildGroupRespVOList(groups, loginUserId));
     }
 
     // ==================== 群成员的写操作 ====================
@@ -120,4 +142,59 @@ public class ImGroupController {
         return success(true);
     }
 
+    // ==================== 群消息置顶 ====================
+
+    @PutMapping("/pin-message")
+    @Operation(summary = "置顶群消息（群主 / 管理员）")
+    public CommonResult<Boolean> pinGroupMessage(@Valid @RequestBody ImGroupMessagePinReqVO reqVO) {
+        groupService.pinGroupMessage(getLoginUserId(), reqVO.getGroupId(), reqVO.getMessageId());
+        return success(true);
+    }
+
+    @PutMapping("/unpin-message")
+    @Operation(summary = "取消置顶群消息（群主 / 管理员）")
+    public CommonResult<Boolean> unpinGroupMessage(@Valid @RequestBody ImGroupMessagePinReqVO reqVO) {
+        groupService.unpinGroupMessage(getLoginUserId(), reqVO.getGroupId(), reqVO.getMessageId());
+        return success(true);
+    }
+
+    /** 单群转 VO + 关联回填 pinnedMessages（仅当登录用户是该群有效成员） */
+    private ImGroupRespVO buildGroupRespVO(ImGroupDO group, Long loginUserId) {
+        if (group == null) {
+            return null;
+        }
+        return buildGroupRespVOList(Collections.singletonList(group), loginUserId).get(0);
+    }
+
+    /**
+     * 群列表批量转 VO + 关联回填 pinnedMessages
+     * <p>
+     * 仅当登录用户是某群的有效成员时才回填该群的 pinnedMessages，避免非成员 / 已退群用户越权拿到置顶消息内容
+     */
+    private List<ImGroupRespVO> buildGroupRespVOList(List<ImGroupDO> groups, Long loginUserId) {
+        if (CollUtil.isEmpty(groups)) {
+            return Collections.emptyList();
+        }
+        // 仅当前用户是有效成员的群才允许回填置顶消息（按 groupId 一次性 IN 查成员关系）
+        Set<Long> activeGroupIds = convertSet(
+                groupMemberService.getActiveGroupMemberListByUserId(loginUserId), ImGroupMemberDO::getGroupId);
+        // 把 active 群的 pinnedMessageIds 一次性聚合 IN 查询，避免 N+1
+        Set<Long> allMessageIds = convertSetByFlatMap(groups, group -> activeGroupIds.contains(group.getId())
+                ? CollUtil.emptyIfNull(group.getPinnedMessageIds()).stream() : Stream.empty());
+        Map<Long, ImGroupMessageDO> messageMap = groupMessageService.getGroupMessageMap(allMessageIds);
+        return CollectionUtils.convertList(groups, group -> {
+            ImGroupRespVO vo = BeanUtils.toBean(group, ImGroupRespVO.class);
+            if (!activeGroupIds.contains(group.getId()) || CollUtil.isEmpty(group.getPinnedMessageIds())) {
+                return vo;
+            }
+            // 按 pin 顺序输出，已被删除的消息（messageMap 没命中）跳过
+            // TODO @AI：使用 CollUtils convert 进一步简化。
+            List<ImGroupMessageRespVO> pinned = group.getPinnedMessageIds().stream()
+                    .map(messageMap::get).filter(Objects::nonNull)
+                    .map(msg -> BeanUtils.toBean(msg, ImGroupMessageRespVO.class))
+                    .collect(Collectors.toList());
+            return vo.setPinnedMessages(pinned);
+        });
+    }
+
 }
diff --git a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/controller/admin/group/vo/ImGroupMessagePinReqVO.java b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/controller/admin/group/vo/ImGroupMessagePinReqVO.java
new file mode 100644
index 0000000..0e4dfac
--- /dev/null
+++ b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/controller/admin/group/vo/ImGroupMessagePinReqVO.java
@@ -0,0 +1,22 @@
+package cn.iocoder.yudao.module.im.controller.admin.group.vo;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import jakarta.validation.constraints.NotNull;
+import lombok.Data;
+
+/**
+ * 管理后台 - 群消息置顶 / 取消置顶 Request VO
+ */
+@Schema(description = "管理后台 - 群消息置顶 / 取消置顶 Request VO")
+@Data
+public class ImGroupMessagePinReqVO {
+
+    @Schema(description = "群编号", requiredMode = Schema.RequiredMode.REQUIRED, example = "13279")
+    @NotNull(message = "群编号不能为空")
+    private Long groupId;
+
+    @Schema(description = "消息编号", requiredMode = Schema.RequiredMode.REQUIRED, example = "9527")
+    @NotNull(message = "消息编号不能为空")
+    private Long messageId;
+
+}
diff --git a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/controller/admin/group/vo/ImGroupRespVO.java b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/controller/admin/group/vo/ImGroupRespVO.java
index 037daf0..3f76444 100644
--- a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/controller/admin/group/vo/ImGroupRespVO.java
+++ b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/controller/admin/group/vo/ImGroupRespVO.java
@@ -1,9 +1,11 @@
 package cn.iocoder.yudao.module.im.controller.admin.group.vo;
 
+import cn.iocoder.yudao.module.im.controller.admin.message.vo.group.ImGroupMessageRespVO;
 import io.swagger.v3.oas.annotations.media.Schema;
 import lombok.*;
 
 import java.time.LocalDateTime;
+import java.util.List;
 
 @Schema(description = "管理后台 - 群 Response VO")
 @Data
@@ -39,4 +41,7 @@ public class ImGroupRespVO {
     @Schema(description = "创建时间", requiredMode = Schema.RequiredMode.REQUIRED)
     private LocalDateTime createTime;
 
+    @Schema(description = "群置顶消息列表，按 pin 顺序（最先置顶的在前）；非该群有效成员时为空")
+    private List<ImGroupMessageRespVO> pinnedMessages;
+
 }
\ No newline at end of file
diff --git a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/dal/dataobject/group/ImGroupDO.java b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/dal/dataobject/group/ImGroupDO.java
index c304938..95a497e 100644
--- a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/dal/dataobject/group/ImGroupDO.java
+++ b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/dal/dataobject/group/ImGroupDO.java
@@ -2,19 +2,22 @@ package cn.iocoder.yudao.module.im.dal.dataobject.group;
 
 import cn.iocoder.yudao.framework.common.enums.CommonStatusEnum;
 import cn.iocoder.yudao.framework.mybatis.core.dataobject.BaseDO;
+import cn.iocoder.yudao.framework.mybatis.core.type.LongListTypeHandler;
 import com.baomidou.mybatisplus.annotation.KeySequence;
+import com.baomidou.mybatisplus.annotation.TableField;
 import com.baomidou.mybatisplus.annotation.TableId;
 import com.baomidou.mybatisplus.annotation.TableName;
 import lombok.*;
 
 import java.time.LocalDateTime;
+import java.util.List;
 
 /**
  * IM 群信息 DO
  *
  * @author 芋道源码
  */
-@TableName("im_group")
+@TableName(value = "im_group",autoResultMap = true)
 @KeySequence("im_group_seq") // 用于 Oracle、PostgreSQL、Kingbase、DB2、H2 数据库的主键自增。如果是 MySQL 等数据库，可不写。
 @Data
 @EqualsAndHashCode(callSuper = true)
@@ -70,5 +73,12 @@ public class ImGroupDO extends BaseDO {
      * 解散时间
      */
     private LocalDateTime dissolvedTime;
+    /**
+     * 群置顶消息编号列表
+     * <p>
+     * 仅存 messageId，操作人 / 置顶时间从对应 PIN 事件的消息记录里反查
+     */
+    @TableField(typeHandler = LongListTypeHandler.class)
+    private List<Long> pinnedMessageIds;
 
 }
diff --git a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/enums/ErrorCodeConstants.java b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/enums/ErrorCodeConstants.java
index b621d0f..3b3ef1e 100644
--- a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/enums/ErrorCodeConstants.java
+++ b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/enums/ErrorCodeConstants.java
@@ -17,6 +17,7 @@ public interface ErrorCodeConstants {
     ErrorCode MESSAGE_PULL_SIZE_EXCEEDED = new ErrorCode(1_040_300_005, "单次拉取消息数量不能超过 {} 条");
     ErrorCode MESSAGE_RECALL_TIMEOUT = new ErrorCode(1_040_300_007, "超过 {} 分钟的消息无法撤回");
     ErrorCode MESSAGE_QUOTE_INVALID = new ErrorCode(1_040_300_008, "引用的消息不可用");
+    ErrorCode MESSAGE_NOT_IN_GROUP = new ErrorCode(1_040_300_009, "消息不属于该群");
 
     // ========== 群 (1-040-400-000) ==========
     ErrorCode GROUP_NOT_EXISTS = new ErrorCode(1_040_400_000, "群不存在");
@@ -25,6 +26,9 @@ public interface ErrorCodeConstants {
     ErrorCode GROUP_NOT_OWNER = new ErrorCode(1_040_400_003, "仅群主可执行该操作");
     ErrorCode GROUP_NOT_OWNER_OR_ADMIN = new ErrorCode(1_040_400_004, "仅群主或管理员可执行该操作");
     ErrorCode GROUP_TRANSFER_OWNER_TO_SELF = new ErrorCode(1_040_400_005, "不能将群主转让给自己");
+    ErrorCode GROUP_MESSAGE_PIN_MAX_LIMIT = new ErrorCode(1_040_400_006, "群置顶消息数量不能超过 {} 条");
+    ErrorCode GROUP_MESSAGE_ALREADY_PINNED = new ErrorCode(1_040_400_007, "该消息已置顶");
+    ErrorCode GROUP_MESSAGE_NOT_PINNED = new ErrorCode(1_040_400_008, "该消息未置顶");
 
     // ========== 群成员 (1-040-500-000) ==========
     ErrorCode GROUP_MEMBER_NOT_IN_GROUP = new ErrorCode(1_040_500_001, "您已不在该群中");
diff --git a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/enums/message/ImMessageTypeEnum.java b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/enums/message/ImMessageTypeEnum.java
index 1af681b..f292de9 100644
--- a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/enums/message/ImMessageTypeEnum.java
+++ b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/enums/message/ImMessageTypeEnum.java
@@ -159,7 +159,16 @@ public enum ImMessageTypeEnum implements ArrayValuable<Integer> {
      * 对应自己的类：GroupMemberSettingUpdateNotification
      * 场景：用户改自己的群免打扰 / 群备注，仅推该用户其他在线终端做多端同步
      */
-    GROUP_MEMBER_SETTING_UPDATE(1530, "群成员个人设置变更", false, false);
+    GROUP_MEMBER_SETTING_UPDATE(1530, "群成员个人设置变更", false, false),
+    // TODO @AI：注释风格，还是参考上面的
+    /**
+     * 自有扩展：群主 / 管理员置顶一条群消息，全员广播；前端把 messageId 加入 group.pinnedMessageIds
+     */
+    GROUP_MESSAGE_PIN(1531, "群消息置顶", true, false),
+    /**
+     * 自有扩展：群主 / 管理员取消置顶，全员广播；前端把 messageId 从 group.pinnedMessageIds 移除
+     */
+    GROUP_MESSAGE_UNPIN(1532, "群消息取消置顶", true, false);
 
     public static final Integer[] ARRAYS = Arrays.stream(values()).map(ImMessageTypeEnum::getType).toArray(Integer[]::new);
 
diff --git a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/group/ImGroupService.java b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/group/ImGroupService.java
index 8f973a5..25a80a8 100644
--- a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/group/ImGroupService.java
+++ b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/group/ImGroupService.java
@@ -154,6 +154,26 @@ public interface ImGroupService {
      */
     void transferGroupOwner(Long userId, @Valid ImGroupTransferOwnerReqVO transferReqVO);
 
+    /**
+     * 置顶群消息（仅群主或管理员可执行）
+     * <p>
+     * 上限 {@link cn.iocoder.yudao.module.im.enums.ImCommonConstants#GROUP_PIN_MAX_COUNT}；幂等失败时抛业务异常
+     *
+     * @param userId    当前登录用户编号
+     * @param groupId   群编号
+     * @param messageId 被置顶的消息编号
+     */
+    void pinGroupMessage(Long userId, Long groupId, Long messageId);
+
+    /**
+     * 取消置顶群消息（仅群主或管理员可执行）
+     *
+     * @param userId    当前登录用户编号
+     * @param groupId   群编号
+     * @param messageId 被取消置顶的消息编号
+     */
+    void unpinGroupMessage(Long userId, Long groupId, Long messageId);
+
     // ==================== 管理后台 ====================
 
     /**
diff --git a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/group/ImGroupServiceImpl.java b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/group/ImGroupServiceImpl.java
index d213bd8..7e0b642 100644
--- a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/group/ImGroupServiceImpl.java
+++ b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/group/ImGroupServiceImpl.java
@@ -22,8 +22,11 @@ import cn.iocoder.yudao.module.im.controller.admin.manager.group.vo.ImGroupManag
 import cn.iocoder.yudao.module.im.dal.dataobject.friend.ImFriendDO;
 import cn.iocoder.yudao.module.im.dal.dataobject.group.ImGroupDO;
 import cn.iocoder.yudao.module.im.dal.dataobject.group.ImGroupMemberDO;
+import cn.iocoder.yudao.module.im.dal.dataobject.message.ImGroupMessageDO;
 import cn.iocoder.yudao.module.im.dal.mysql.group.ImGroupMapper;
 import cn.iocoder.yudao.module.im.enums.group.ImGroupMemberRoleEnum;
+import cn.iocoder.yudao.module.im.enums.message.ImMessageStatusEnum;
+import cn.iocoder.yudao.module.im.enums.message.ImMessageTypeEnum;
 import cn.iocoder.yudao.module.im.service.friend.ImFriendService;
 import cn.iocoder.yudao.module.im.service.message.ImGroupMessageService;
 import cn.iocoder.yudao.module.im.service.message.dto.ImGroupMessageSendDTO;
@@ -363,6 +366,68 @@ public class ImGroupServiceImpl implements ImGroupService {
                 ImGroupMessageSendDTO.ofGroupOwnerTransfer(groupId, userId, newOwnerUserId));
     }
 
+    @Override
+    @CacheEvict(cacheNames = GROUP, key = "#groupId")
+    @Transactional(rollbackFor = Exception.class)
+    public void pinGroupMessage(Long userId, Long groupId, Long messageId) {
+        // 1. 校验群主 / 管理员；同时拿到 group 复用，避免再走一次 @Cacheable
+        ImGroupDO group = validateOwnerOrAdminAndGetGroup(groupId, userId);
+        // 2. 校验消息属于该群、是普通聊天消息（绕过前端菜单不允许置顶群事件 / 撤回事件）、且未被撤回
+        ImGroupMessageDO message = groupMessageService.getGroupMessage(messageId);
+        if (message == null || ObjUtil.notEqual(message.getGroupId(), groupId)) {
+            throw exception(MESSAGE_NOT_IN_GROUP);
+        }
+        if (!ImMessageTypeEnum.validate(message.getType()).isNormal()
+                || ImMessageStatusEnum.RECALL.getStatus().equals(message.getStatus())) {
+            throw exception(MESSAGE_NOT_IN_GROUP);
+        }
+        // 3. 幂等 + 上限校验
+        // TODO @AI：并发读改写非原子（两个管理员同时 pin 不同消息会丢更新），后续考虑 @Version 乐观锁或带旧值条件的 SQL
+        List<Long> pinned = new ArrayList<>(CollUtil.emptyIfNull(group.getPinnedMessageIds()));
+        if (pinned.contains(messageId)) {
+            throw exception(GROUP_MESSAGE_ALREADY_PINNED);
+        }
+        if (pinned.size() >= GROUP_PIN_MAX_COUNT) {
+            throw exception(GROUP_MESSAGE_PIN_MAX_LIMIT, GROUP_PIN_MAX_COUNT);
+        }
+        pinned.add(messageId);
+        groupMapper.updateById(new ImGroupDO().setId(groupId).setPinnedMessageIds(pinned));
+
+        // 4. 推送 GROUP_MESSAGE_PIN 通知给全员；payload 直接带消息对象，前端不用回查群详情绕开 @CacheEvict 时序
+        groupMessageService.sendGroupMessage(userId,
+                ImGroupMessageSendDTO.ofGroupMessagePin(groupId, userId, message));
+    }
+
+    @Override
+    @CacheEvict(cacheNames = GROUP, key = "#groupId")
+    @Transactional(rollbackFor = Exception.class)
+    public void unpinGroupMessage(Long userId, Long groupId, Long messageId) {
+        // 1. 校验群主 / 管理员；同时拿到 group 复用，避免再走一次 @Cacheable
+        ImGroupDO group = validateOwnerOrAdminAndGetGroup(groupId, userId);
+        // 2. 幂等校验
+        // TODO @AI：并发读改写非原子，后续考虑 @Version 乐观锁或带旧值条件的 SQL
+        List<Long> pinned = new ArrayList<>(CollUtil.emptyIfNull(group.getPinnedMessageIds()));
+        if (!pinned.contains(messageId)) {
+            throw exception(GROUP_MESSAGE_NOT_PINNED);
+        }
+        pinned.remove(messageId);
+        groupMapper.updateById(new ImGroupDO().setId(groupId).setPinnedMessageIds(pinned));
+
+        // 3. 推送 GROUP_MESSAGE_UNPIN 通知给全员
+        groupMessageService.sendGroupMessage(userId,
+                ImGroupMessageSendDTO.ofGroupMessageUnpin(groupId, userId, messageId));
+    }
+
+    /** 校验登录用户是群主 / 管理员，同时返回 group（复用 validateGroupExists 的查询，避免调用方再查一次） */
+    private ImGroupDO validateOwnerOrAdminAndGetGroup(Long groupId, Long userId) {
+        ImGroupDO group = validateGroupExists(groupId);
+        ImGroupMemberDO member = groupMemberService.validateMemberInGroup(groupId, userId);
+        if (!ImGroupMemberRoleEnum.isOwnerOrAdmin(member.getRole())) {
+            throw exception(GROUP_NOT_OWNER_OR_ADMIN);
+        }
+        return group;
+    }
+
     // ==================== 群的读操作 ====================
 
     @Override
diff --git a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/message/ImGroupMessageService.java b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/message/ImGroupMessageService.java
index 57cfce6..51a28f1 100644
--- a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/message/ImGroupMessageService.java
+++ b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/message/ImGroupMessageService.java
@@ -9,6 +9,7 @@ import cn.iocoder.yudao.module.im.service.message.dto.ImGroupMessageSendDTO;
 
 import java.util.Collection;
 import java.util.List;
+import java.util.Map;
 
 /**
  * IM 群聊消息 Service 接口
@@ -138,5 +139,21 @@ public interface ImGroupMessageService {
      */
     ImGroupMessageDO getGroupMessage(Long id);
 
+    /**
+     * 批量按消息编号查询群聊消息
+     *
+     * @param ids 消息编号集合
+     * @return 消息列表
+     */
+    List<ImGroupMessageDO> getGroupMessageList(Collection<Long> ids);
+
+    /**
+     * 批量按消息编号查询群聊消息，返回 messageId → DO 映射
+     *
+     * @param ids 消息编号集合
+     * @return 消息 Map（key = 消息编号）
+     */
+    Map<Long, ImGroupMessageDO> getGroupMessageMap(Collection<Long> ids);
+
 }
 
diff --git a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/message/ImGroupMessageServiceImpl.java b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/message/ImGroupMessageServiceImpl.java
index 98a3c1c..f00ac09 100644
--- a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/message/ImGroupMessageServiceImpl.java
+++ b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/message/ImGroupMessageServiceImpl.java
@@ -588,6 +588,19 @@ public class ImGroupMessageServiceImpl implements ImGroupMessageService {
         return groupMessageMapper.selectById(id);
     }
 
+    @Override
+    public List<ImGroupMessageDO> getGroupMessageList(Collection<Long> ids) {
+        if (CollUtil.isEmpty(ids)) {
+            return Collections.emptyList();
+        }
+        return groupMessageMapper.selectByIds(ids);
+    }
+
+    @Override
+    public Map<Long, ImGroupMessageDO> getGroupMessageMap(Collection<Long> ids) {
+        return convertMap(getGroupMessageList(ids), ImGroupMessageDO::getId);
+    }
+
     private ImGroupMessageServiceImpl getSelf() {
         return SpringUtil.getBean(getClass());
     }
diff --git a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/message/dto/ImGroupMessageSendDTO.java b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/message/dto/ImGroupMessageSendDTO.java
index cf29435..33eeb83 100644
--- a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/message/dto/ImGroupMessageSendDTO.java
+++ b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/message/dto/ImGroupMessageSendDTO.java
@@ -160,4 +160,22 @@ public class ImGroupMessageSendDTO {
                 .setType(ImMessageTypeEnum.GROUP_MEMBER_SETTING_UPDATE.getType()).setContent(notification);
     }
 
+    public static ImGroupMessageSendDTO ofGroupMessagePin(Long groupId, Long operatorUserId,
+                                                          cn.iocoder.yudao.module.im.dal.dataobject.message.ImGroupMessageDO message) {
+        GroupMessagePinNotification notification = new GroupMessagePinNotification();
+        notification.setOperatorUserId(operatorUserId);
+        notification.setMessageId(message.getId());
+        notification.setMessage(message);
+        return new ImGroupMessageSendDTO().setGroupId(groupId)
+                .setType(ImMessageTypeEnum.GROUP_MESSAGE_PIN.getType()).setContent(notification);
+    }
+
+    public static ImGroupMessageSendDTO ofGroupMessageUnpin(Long groupId, Long operatorUserId, Long messageId) {
+        GroupMessageUnpinNotification notification = new GroupMessageUnpinNotification();
+        notification.setOperatorUserId(operatorUserId);
+        notification.setMessageId(messageId);
+        return new ImGroupMessageSendDTO().setGroupId(groupId)
+                .setType(ImMessageTypeEnum.GROUP_MESSAGE_UNPIN.getType()).setContent(notification);
+    }
+
 }
diff --git a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/websocket/dto/notification/GroupMessagePinNotification.java b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/websocket/dto/notification/GroupMessagePinNotification.java
new file mode 100644
index 0000000..12d509e
--- /dev/null
+++ b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/websocket/dto/notification/GroupMessagePinNotification.java
@@ -0,0 +1,23 @@
+package cn.iocoder.yudao.module.im.service.websocket.dto.notification;
+
+import cn.iocoder.yudao.module.im.dal.dataobject.message.ImGroupMessageDO;
+import lombok.Data;
+
+/**
+ * 群消息置顶事件通知
+ * <p>
+ * payload 直接携带被置顶的完整消息对象，前端按 message 直接 push 到 pinnedMessages，避免 GET /im/group/get 命中 @CacheEvict 触发前的旧 cache
+ */
+@Data
+public class GroupMessagePinNotification extends BaseGroupNotification {
+
+    /**
+     * 被置顶的消息编号
+     */
+    private Long messageId;
+    /**
+     * 被置顶的完整消息对象（避免前端回查群详情）
+     */
+    private ImGroupMessageDO message;
+
+}
diff --git a/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/websocket/dto/notification/GroupMessageUnpinNotification.java b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/websocket/dto/notification/GroupMessageUnpinNotification.java
new file mode 100644
index 0000000..204fa2a
--- /dev/null
+++ b/yudao-module-im/src/main/java/cn/iocoder/yudao/module/im/service/websocket/dto/notification/GroupMessageUnpinNotification.java
@@ -0,0 +1,16 @@
+package cn.iocoder.yudao.module.im.service.websocket.dto.notification;
+
+import lombok.Data;
+
+/**
+ * 群消息取消置顶事件通知
+ */
+@Data
+public class GroupMessageUnpinNotification extends BaseGroupNotification {
+
+    /**
+     * 被取消置顶的消息编号
+     */
+    private Long messageId;
+
+}
diff --git a/yudao-module-im/src/test/resources/sql/create_tables.sql b/yudao-module-im/src/test/resources/sql/create_tables.sql
index 518447a..6689d38 100644
--- a/yudao-module-im/src/test/resources/sql/create_tables.sql
+++ b/yudao-module-im/src/test/resources/sql/create_tables.sql
@@ -3,7 +3,7 @@ CREATE TABLE IF NOT EXISTS "im_private_message" (
     "client_message_id" varchar(64) DEFAULT NULL COMMENT '客户端消息编号',
     "sender_id" bigint NOT NULL COMMENT '发送人编号',
     "receiver_id" bigint NOT NULL COMMENT '接收人编号',
-    "type" tinyint NOT NULL COMMENT '消息类型',
+    "type" smallint NOT NULL COMMENT '消息类型',
     "content" varchar(4096) DEFAULT NULL COMMENT '消息内容',
     "status" tinyint NOT NULL COMMENT '消息状态',
     "send_time" timestamp NOT NULL COMMENT '发送时间',
@@ -21,7 +21,7 @@ CREATE TABLE IF NOT EXISTS "im_group_message" (
     "client_message_id" varchar(64) DEFAULT NULL COMMENT '客户端消息编号',
     "sender_id" bigint NOT NULL COMMENT '发送人编号',
     "group_id" bigint NOT NULL COMMENT '群编号',
-    "type" tinyint NOT NULL COMMENT '消息类型',
+    "type" smallint NOT NULL COMMENT '消息类型',
     "content" varchar(4096) DEFAULT NULL COMMENT '消息内容',
     "status" tinyint NOT NULL COMMENT '消息状态',
     "send_time" timestamp NOT NULL COMMENT '发送时间',
@@ -48,6 +48,7 @@ CREATE TABLE IF NOT EXISTS "im_group" (
     "banned_time" timestamp DEFAULT NULL COMMENT '封禁时间',
     "status" tinyint NOT NULL COMMENT '群状态',
     "dissolved_time" timestamp DEFAULT NULL COMMENT '解散时间',
+    "pinned_message_ids" varchar(128) DEFAULT NULL COMMENT '群置顶消息编号列表，逗号分隔',
     "creator" varchar(64) DEFAULT '',
     "create_time" timestamp NOT NULL DEFAULT CURRENT_TIMESTAMP,
     "updater" varchar(64) DEFAULT '',