diff --git a/code/datastudio/src/org.opengauss.mppdbide.debuger/src/org/opengauss/mppdbide/debuger/service/DebugService.java b/code/datastudio/src/org.opengauss.mppdbide.debuger/src/org/opengauss/mppdbide/debuger/service/DebugService.java
index ea5d4e2dbb80fc7af994312a22d1188481887edf..b5278971ccd1d1827a98178a1a13ae6b3fff0b3f 100644
--- a/code/datastudio/src/org.opengauss.mppdbide.debuger/src/org/opengauss/mppdbide/debuger/service/DebugService.java
+++ b/code/datastudio/src/org.opengauss.mppdbide.debuger/src/org/opengauss/mppdbide/debuger/service/DebugService.java
@@ -102,9 +102,11 @@ public class DebugService implements NoticeListener, EventHander, IDebugService
      */
     public void prepareDebug() throws SQLException {
         List<Object> inputsParams = Arrays.asList(functionVo.oid);
-        serverConn.getDebugOptPrepareStatement(
+        try (PreparedStatement ps = serverConn.getDebugOptPrepareStatement(
                 DebugConstants.DebugOpt.START_SESSION,
-                inputsParams).execute();
+                inputsParams)) {
+			ps.execute();
+        }
     }
 
     /**
@@ -203,9 +205,11 @@ public class DebugService implements NoticeListener, EventHander, IDebugService
      * @throws SQLException the exp
      */
     public void debugOff() throws SQLException {
-        serverConn.getDebugOptPrepareStatement(
+    	try (PreparedStatement ps = serverConn.getDebugOptPrepareStatement(
                 DebugConstants.DebugOpt.DEBUG_OFF,
-                new ArrayList<Object>(1)).execute();
+                new ArrayList<Object>(1))) {
+		    ps.execute();
+    	}
     }
 
     /**
@@ -349,6 +353,7 @@ public class DebugService implements NoticeListener, EventHander, IDebugService
     }
 
     private <T> List<T> getListVos(DebugConstants.DebugOpt debugOpt, Class<T> clazz) throws SQLException {
+        validCheckForConnection();
         List<Object> inputParams = Arrays.asList(sessionVo.clientPort);
         try (PreparedStatement ps = clientConn.getDebugOptPrepareStatement(
                 debugOpt, inputParams)) {
@@ -397,6 +402,7 @@ public class DebugService implements NoticeListener, EventHander, IDebugService
             positionVo.func = functionVo.oid;
         }
 
+        validCheckForConnection();
         List<Object> inputParams = Arrays.asList(
                 sessionVo.clientPort,
                 positionVo.func,
@@ -677,8 +683,15 @@ public class DebugService implements NoticeListener, EventHander, IDebugService
     }
 
     private void serverExecuteInner(String sql) throws SQLException {
+        validCheckForConnection();
         try (PreparedStatement ps = serverConn.getStatement(sql)) {
             ps.execute();
         }
     }
+    
+    private void validCheckForConnection() throws SQLException {
+        if (serverConn == null || clientConn == null) {
+            throw new SQLException("debug connection already disconnect!");
+        }
+    }
 }
diff --git a/code/datastudio/src/org.opengauss.mppdbide.view/src/org/opengauss/mppdbide/view/handler/debug/StartDebugHandler.java b/code/datastudio/src/org.opengauss.mppdbide.view/src/org/opengauss/mppdbide/view/handler/debug/StartDebugHandler.java
index 14ad5dcedd8205fbf1f346740dbea3370d6bc40a..25039542cd15cb3a0c13ab0522ada49c886e332c 100644
--- a/code/datastudio/src/org.opengauss.mppdbide.view/src/org/opengauss/mppdbide/view/handler/debug/StartDebugHandler.java
+++ b/code/datastudio/src/org.opengauss.mppdbide.view/src/org/opengauss/mppdbide/view/handler/debug/StartDebugHandler.java
@@ -29,6 +29,8 @@ import org.opengauss.mppdbide.bl.serverdatacache.DefaultParameter;
 import org.opengauss.mppdbide.bl.serverdatacache.IDebugObject;
 import org.opengauss.mppdbide.bl.serverdatacache.ObjectParameter;
 import org.opengauss.mppdbide.bl.serverdatacache.ObjectParameter.PARAMETERTYPE;
+import org.opengauss.mppdbide.debuger.service.DebugService;
+import org.opengauss.mppdbide.debuger.service.WrappedDebugService;
 import org.opengauss.mppdbide.utils.IMessagesConstants;
 import org.opengauss.mppdbide.utils.exceptions.DatabaseCriticalException;
 import org.opengauss.mppdbide.utils.exceptions.DatabaseOperationException;
@@ -143,7 +145,11 @@ public class StartDebugHandler {
                         .get(debugObject.getOid());
                 debugParams = getDebugParams(serverParams);
             }
-            serviceHelper.getDebugService().begin(debugParams);
+            WrappedDebugService debugService = serviceHelper.getDebugService();
+            if (debugService == null) {
+                throw new SQLException("you operation too quick, please retry slowly!");
+            }
+            debugService.begin(debugParams);
             debugUtils.setDebugStart(true);
         } catch (DatabaseCriticalException exception) {
             UIDisplayFactoryProvider.getUIDisplayStateIf().handleDBCriticalError(exception, debugObject.getDatabase());
@@ -157,6 +163,12 @@ public class StartDebugHandler {
                     exception);
             MPPDBIDEDialogs.generateErrorDialog(MessageConfigLoader.getProperty(IMessagesConstants.PLSQL_ERR),
                     MessageConfigLoader.getProperty(IMessagesConstants.UNKNOWN_INTERNAL_ERR), exception);
+        } catch (Exception allExp) {
+            MPPDBIDELoggerUtility.error(
+                    "unknown exception occur " + allExp.getMessage(),
+                    allExp);
+            MPPDBIDEDialogs.generateErrorDialog(MessageConfigLoader.getProperty(IMessagesConstants.PLSQL_ERR),
+                    MessageConfigLoader.getProperty(IMessagesConstants.UNKNOWN_INTERNAL_ERR), allExp);
         }
     }