diff --git a/src/main/java/com/genersoft/iot/vmp/aiot/dao/AiAlertMapper.java b/src/main/java/com/genersoft/iot/vmp/aiot/dao/AiAlertMapper.java
index cbd830c4e..cbd328d3c 100644
--- a/src/main/java/com/genersoft/iot/vmp/aiot/dao/AiAlertMapper.java
+++ b/src/main/java/com/genersoft/iot/vmp/aiot/dao/AiAlertMapper.java
@@ -15,8 +15,11 @@ public interface AiAlertMapper {
     @Options(useGeneratedKeys = true, keyProperty = "id", keyColumn = "id")
     int add(AiAlert alert);
 
+    @Select("SELECT COUNT(1) FROM wvp_ai_alert WHERE alert_id=#{alertId}")
+    int countByAlertId(@Param("alertId") String alertId);
+
     @Select("SELECT a.*, r.name AS roi_name, " +
-            "COALESCE(SUBSTRING_INDEX(sp.gb_name, '/', 1), sp.name, sp.app) AS camera_name " +
+            "COALESCE(sp.name, sp.app) AS camera_name " +
             "FROM wvp_ai_alert a " +
             "LEFT JOIN wvp_ai_roi r ON a.roi_id = r.roi_id " +
             "LEFT JOIN wvp_stream_proxy sp ON a.camera_id = sp.camera_code " +
@@ -29,7 +32,7 @@ public interface AiAlertMapper {
 
     @Select(value = {"<script>" +
             "SELECT a.*, r.name AS roi_name, " +
-            "COALESCE(SUBSTRING_INDEX(sp.gb_name, '/', 1), sp.name, sp.app) AS camera_name " +
+            "COALESCE(sp.name, sp.app) AS camera_name " +
             "FROM wvp_ai_alert a " +
             "LEFT JOIN wvp_ai_roi r ON a.roi_id = r.roi_id " +
             "LEFT JOIN wvp_stream_proxy sp ON a.camera_id = sp.camera_code " +
diff --git a/src/main/java/com/genersoft/iot/vmp/aiot/service/impl/AiAlertServiceImpl.java b/src/main/java/com/genersoft/iot/vmp/aiot/service/impl/AiAlertServiceImpl.java
index cacdff3dd..9cb3972a2 100644
--- a/src/main/java/com/genersoft/iot/vmp/aiot/service/impl/AiAlertServiceImpl.java
+++ b/src/main/java/com/genersoft/iot/vmp/aiot/service/impl/AiAlertServiceImpl.java
@@ -27,9 +27,8 @@ public class AiAlertServiceImpl implements IAiAlertService {
         if (alert.getReceivedAt() == null) {
             alert.setReceivedAt(LocalDateTime.now().format(FORMATTER));
         }
-        // 防止重复插入
-        AiAlert existing = alertMapper.queryByAlertId(alert.getAlertId());
-        if (existing != null) {
+        // 防止重复插入（轻量查询，不做 JOIN）
+        if (alertMapper.countByAlertId(alert.getAlertId()) > 0) {
             log.debug("[AiAlert] 告警已存在, 跳过: alertId={}", alert.getAlertId());
             return;
         }