diff --git a/plugin/sugonSdnController/src/main/java/org/zstack/sugonSdnController/controller/neutronClient/TfPortClient.java b/plugin/sugonSdnController/src/main/java/org/zstack/sugonSdnController/controller/neutronClient/TfPortClient.java
index 443760c64607220583d0b03e111eed726f359127..7e3c1e1a43bad79a28545da574b806e6ae6cb9fe 100644
--- a/plugin/sugonSdnController/src/main/java/org/zstack/sugonSdnController/controller/neutronClient/TfPortClient.java
+++ b/plugin/sugonSdnController/src/main/java/org/zstack/sugonSdnController/controller/neutronClient/TfPortClient.java
@@ -498,6 +498,10 @@ public class TfPortClient {
         } catch (IOException e) {
             throw new RuntimeException(e);
         }
+        if (portObj == null) {
+            response.setCode(200);
+            return response;
+        }
         String instanceId;
         if (Objects.equals(portObj.getParentType(), "virtual-machine")) {
             instanceId = portObj.getParentUuid();
diff --git a/plugin/sugonSdnController/src/main/java/org/zstack/sugonSdnController/network/TfL2Network.java b/plugin/sugonSdnController/src/main/java/org/zstack/sugonSdnController/network/TfL2Network.java
index f8753453ab7a8a93a2028bbc5519ff91caef6fe1..a3ba74240c935019eab820b90a521b7256c33ed5 100644
--- a/plugin/sugonSdnController/src/main/java/org/zstack/sugonSdnController/network/TfL2Network.java
+++ b/plugin/sugonSdnController/src/main/java/org/zstack/sugonSdnController/network/TfL2Network.java
@@ -1,6 +1,8 @@
 package org.zstack.sugonSdnController.network;
 
 import org.springframework.beans.factory.annotation.Autowired;
+import org.zstack.header.network.l3.L3NetworkVO;
+import org.zstack.header.network.l3.L3NetworkVO_;
 import org.zstack.sugonSdnController.controller.SugonSdnController;
 import org.zstack.sugonSdnController.controller.SugonSdnControllerConstant;
 import org.zstack.core.db.Q;
@@ -18,6 +20,7 @@ import org.zstack.sdnController.header.SdnControllerVO;
 import org.zstack.sdnController.header.SdnControllerVO_;
 
 import static org.zstack.core.Platform.err;
+import static org.zstack.core.Platform.operr;
 
 public class TfL2Network extends L2NoVlanNetwork implements TfL2NetworkExtensionPoint{
 
@@ -190,6 +193,12 @@ public class TfL2Network extends L2NoVlanNetwork implements TfL2NetworkExtension
 
     private void handle(APIDeleteL2NetworkMsg msg) {
         APIDeleteL2NetworkEvent evt = new APIDeleteL2NetworkEvent(msg.getId());
+        if(Q.New(L3NetworkVO.class).eq(L3NetworkVO_.l2NetworkUuid, msg.getL2NetworkUuid()).count() > 0){
+            String error = String.format("L2Network[%s] still has some L3Networks, please delete L3Networks first.", msg.getL2NetworkUuid());
+            evt.setError(operr(error));
+            bus.publish(evt);
+            return;
+        }
         deleteTfL2NetworkOnSdnController(self, new Completion(msg) {
             @Override
             public void success() {
diff --git a/plugin/sugonSdnController/src/main/java/org/zstack/sugonSdnController/network/TfNicManageExtensionPointImpl.java b/plugin/sugonSdnController/src/main/java/org/zstack/sugonSdnController/network/TfNicManageExtensionPointImpl.java
index fd8e7733256e4b124f1dbe298db59e32010fa6e1..24bf1e8ff9326383c6d63036bb81f9185a09a33f 100644
--- a/plugin/sugonSdnController/src/main/java/org/zstack/sugonSdnController/network/TfNicManageExtensionPointImpl.java
+++ b/plugin/sugonSdnController/src/main/java/org/zstack/sugonSdnController/network/TfNicManageExtensionPointImpl.java
@@ -31,8 +31,10 @@ public class TfNicManageExtensionPointImpl implements NicManageExtensionPoint {
         nic.setType(VmInstanceConstant.TF_VIRTUAL_NIC_TYPE);
         TfPortResponse port = null;
         String portUuid = msg.getResourceUuid();
+        String tfPortUuid = null;
         if (portUuid != null){
-            port = tfPortService.getTfPort(StringDSL.transToTfUuid(portUuid));
+            tfPortUuid = StringDSL.transToTfUuid(portUuid);
+            port = tfPortService.getTfPort(tfPortUuid);
             if (port != null){
                 String ipAddr = null;
                 for (TfPortIpEntity ipEntrty: port.getFixedIps()) {
@@ -52,7 +54,7 @@ public class TfNicManageExtensionPointImpl implements NicManageExtensionPoint {
         }
         if (port == null) {
             String l2NetworkUuid = l3Network.getL2NetworkUuid();
-            port = tfPortService.createTfPort(StringDSL.transToTfUuid(portUuid), l2NetworkUuid, msg.getL3NetworkUuid(),
+            port = tfPortService.createTfPort(tfPortUuid, l2NetworkUuid, msg.getL3NetworkUuid(),
                     nic.getMac(), msg.getIp());
             logger.debug("Create a new tf port success.");
         }