diff --git a/rc-service/rc-service-other/other-application/src/main/java/com/red/circle/other/app/command/room/RoomMemberChangeIdentityCmdExe.java b/rc-service/rc-service-other/other-application/src/main/java/com/red/circle/other/app/command/room/RoomMemberChangeIdentityCmdExe.java
index 1e90e29d..d8dfaf15 100644
--- a/rc-service/rc-service-other/other-application/src/main/java/com/red/circle/other/app/command/room/RoomMemberChangeIdentityCmdExe.java
+++ b/rc-service/rc-service-other/other-application/src/main/java/com/red/circle/other/app/command/room/RoomMemberChangeIdentityCmdExe.java
@@ -238,6 +238,14 @@ public class RoomMemberChangeIdentityCmdExe {
     if (Objects.isNull(roomMember)) {
       return;
     }
+
+    // 防止反复 游客<->成员 刷任务：30天内同一房主+成员组合只计一次
+    String memberHistoryKey = "room:daily:task:member_history:" + roomOwnerId + ":" + enterUserId;
+    boolean isFirstJoin = redisService.setIfAbsent(memberHistoryKey, "1", 30, TimeUnit.DAYS);
+    if (!isFirstJoin) {
+      return;
+    }
+
     LocalDate createDate = roomMember.getCreateTime().toLocalDateTime()
             .atZone(java.time.ZoneOffset.UTC)
             .withZoneSameInstant(ZoneId.of("Asia/Riyadh"))