diff --git a/im-service/src/main/java/com/xuqm/im/repository/ImMessageRepository.java b/im-service/src/main/java/com/xuqm/im/repository/ImMessageRepository.java
index 22668e4..5673dfe 100644
--- a/im-service/src/main/java/com/xuqm/im/repository/ImMessageRepository.java
+++ b/im-service/src/main/java/com/xuqm/im/repository/ImMessageRepository.java
@@ -34,7 +34,7 @@ public interface ImMessageRepository extends JpaRepository<ImMessageEntity, Stri
               WHERE app_id = :appId AND chat_type = 'GROUP'
                 AND to_id IN (
                   SELECT id FROM im_group
-                  WHERE app_id = :appId AND FIND_IN_SET(:userId, member_ids) > 0
+                  WHERE app_id = :appId AND JSON_CONTAINS(member_ids, JSON_QUOTE(:userId))
                 )
               GROUP BY to_id, chat_type
             ) combined