diff --git a/test/npu/test_device.py b/test/npu/test_device.py
index 156d4c64877ab5e4941a6f0b15891576d7dbcf81..ba32915f1b8859b4faee7068f86a08493d24e1b9 100644
--- a/test/npu/test_device.py
+++ b/test/npu/test_device.py
@@ -97,22 +97,53 @@ class TestDevice(TestCase):
         assert isinstance(device, torch._C.device)
         assert isinstance(device, torch.device)
 
-    def test_multithread_device(self):
+    def test_multithread_device_with_set_device(self):
         import threading
 
         def _worker(result):
             try:
+                torch.npu.set_device("npu:0")
                 cur = torch_npu.npu.current_device()
                 self.assertEqual(cur, 0)
             except Exception:
                 result[0] = 1
 
-        result = [0]
-        torch.npu.set_device("npu:0")
+        result = [0, 0]
+
+        try:
+            torch.npu.set_device("npu:0")
+            cur = torch_npu.npu.current_device()
+            self.assertEqual(cur, 0)
+        except Exception:
+            result[1] = 1
+        thread = threading.Thread(target=_worker, args=(result,))
+        thread.start()
+        thread.join()
+        self.assertEqual(result[0], 0)
+        self.assertEqual(result[1], 0)
+
+    def test_multithread_device_with_no_device(self):
+        import threading
+
+        def _worker(result):
+            try:
+                cur = torch_npu.npu.current_device()
+                self.assertEqual(cur, 0)
+            except Exception:
+                result[0] = 1
+
+        result = [0, 0]
+
+        try:
+            cur = torch_npu.npu.current_device()
+            self.assertEqual(cur, 0)
+        except Exception:
+            result[1] = 1
         thread = threading.Thread(target=_worker, args=(result,))
         thread.start()
         thread.join()
         self.assertEqual(result[0], 0)
+        self.assertEqual(result[1], 0)
 
 
 if __name__ == '__main__':
diff --git a/torch_npu/acl.json b/torch_npu/acl.json
index 8a77faac4fa153432b380a418d81361586790f59..fc0b7aa696d54dc995063905175143b951e09d91 100644
--- a/torch_npu/acl.json
+++ b/torch_npu/acl.json
@@ -1 +1,5 @@
-{"dump":{"dump_scene":"lite_exception"}}
\ No newline at end of file
+{
+    "dump": {
+        "dump_scene": "lite_exception"
+    }
+}
\ No newline at end of file