diff --git a/skywalking-alarm/src/main/java/com/ai/cloud/skywalking/alarm/dao/AlarmMessageDao.java b/skywalking-alarm/src/main/java/com/ai/cloud/skywalking/alarm/dao/AlarmMessageDao.java
index a9c0a4c51..a3c8a5b8b 100644
--- a/skywalking-alarm/src/main/java/com/ai/cloud/skywalking/alarm/dao/AlarmMessageDao.java
+++ b/skywalking-alarm/src/main/java/com/ai/cloud/skywalking/alarm/dao/AlarmMessageDao.java
@@ -131,23 +131,4 @@ public class AlarmMessageDao {
         }
         return rules;
     }
-
-    public static String selectAppCodeByAppId(String appId) throws SQLException {
-        Connection connection = DBConnectUtil.getConnection();
-        try {
-            PreparedStatement ps =
-                    connection.prepareStatement("SELECT app_code FROM application_info WHERE sts = ? AND  application_info.app_id = ?");
-            ps.setString(1, "A");
-            ps.setString(2, appId);
-            ResultSet rs = ps.executeQuery();
-            rs.next();
-            return rs.getString("app_code");
-        } catch (SQLException e) {
-            throw e;
-        } finally {
-            if (connection != null) {
-                connection.close();
-            }
-        }
-    }
 }
diff --git a/skywalking-alarm/src/main/java/com/ai/cloud/skywalking/alarm/procesor/AlarmMessageProcessor.java b/skywalking-alarm/src/main/java/com/ai/cloud/skywalking/alarm/procesor/AlarmMessageProcessor.java
index 59529e7fb..4d53a4a6d 100644
--- a/skywalking-alarm/src/main/java/com/ai/cloud/skywalking/alarm/procesor/AlarmMessageProcessor.java
+++ b/skywalking-alarm/src/main/java/com/ai/cloud/skywalking/alarm/procesor/AlarmMessageProcessor.java
@@ -144,15 +144,4 @@ public class AlarmMessageProcessor {
     }
 
     private static Map<String, String> idCodeMapper = new ConcurrentHashMap<String, String>();
-
-    public static String convertAppId2AppCode(String appId) throws SQLException {
-        String resultCode = idCodeMapper.get(appId);
-        if (resultCode == null) {
-            resultCode = AlarmMessageDao.selectAppCodeByAppId(appId);
-
-            idCodeMapper.put(appId, resultCode);
-        }
-
-        return idCodeMapper.get(appId);
-    }
 }