diff --git a/tests/base/client_base.py b/tests/base/client_base.py
index 8ad48f9..5155a85 100644
--- a/tests/base/client_base.py
+++ b/tests/base/client_base.py
@@ -1,7 +1,20 @@
 from pymilvus import connections
+from api.milvus_cdc import MilvusCdcClient
+
+client = MilvusCdcClient('http://localhost:8444')
 
 
 class TestBase:
+
+    def setup_method(self, method):
+        res, result = client.list_tasks()
+        # delete the tasks
+        for task in res["tasks"]:
+            task_id = task["task_id"]
+            rsp, result = client.delete_task(task_id)
+            assert result
+            assert rsp == {}
+
     def teardown_method(self, method):
         if len(connections.list_connections()) > 0:
             for conn in connections.list_connections():
diff --git a/tests/testcases/test_cdc_create.py b/tests/testcases/test_cdc_create.py
index e426dde..ff90b2e 100644
--- a/tests/testcases/test_cdc_create.py
+++ b/tests/testcases/test_cdc_create.py
@@ -312,19 +312,23 @@ def test_cdc_for_partition_insert_after_cdc_task(self, upstream_host, upstream_p
         assert num_entities_upstream == num_entities_downstream,\
             f"num_entities_upstream {num_entities_upstream} != num_entities_downstream {num_entities_downstream}"
 
-
-    @pytest.mark.skip(reason="https://github.com/zilliztech/milvus-cdc/issues/5")
-    def test_cdc_for_cdc_task_by_max(self, upstream_host, upstream_port, downstream_host, downstream_port):
+    def test_cdc_for_cdc_task_large_than_max_num(self, upstream_host, upstream_port, downstream_host, downstream_port):
         max_task = 100
+        # delete the tasks
+        res, result = client.list_tasks()
+        for task in res["tasks"]:
+            task_id = task["task_id"]
+            rsp, result = client.delete_task(task_id)
+            log.info(f"delete task response: {rsp}")
+            assert result
         res, result = client.list_tasks()
         assert result
         log.info(f"list tasks response: {res}")
         num_tasks = len(res["tasks"])
         log.info(f"num_tasks: {num_tasks}")
         assert num_tasks <= max_task
-
         available_task = max_task - num_tasks
-        for i in range(available_task):
+        for i in range(available_task+3):
             time.sleep(0.01)
             c_name = prefix + datetime.now().strftime('%Y_%m_%d_%H_%M_%S_%f')
             c_infos = [
@@ -343,13 +347,32 @@ def test_cdc_for_cdc_task_by_max(self, upstream_host, upstream_port, downstream_
                 "collection_infos": c_infos
             }
             rsp, result = client.create_task(request_data)
-            assert result
-            log.info(f"create task response: {rsp}")
-            task_id = rsp['task_id']
-            log.info(f"task_id: {task_id}")
+            if i < available_task:
+                assert result
+                log.info(f"create task response: {rsp}")
+                task_id = rsp['task_id']
+                log.info(f"task_id: {task_id}")
+            else:
+                log.info(f"create task response: {rsp}")
+                # assert not result
+
         # check the number of tasks
         res, result = client.list_tasks()
         assert result
         log.info(f"list tasks response: {res}")
         num_tasks = len(res["tasks"])
         log.info(f"num_tasks: {num_tasks}")
+        assert num_tasks == max_task
+        # delete the tasks
+        for task in res["tasks"]:
+            task_id = task["task_id"]
+            rsp, result = client.delete_task(task_id)
+            log.info(f"delete task response: {rsp}")
+            assert result
+
+        # check the number of tasks
+        res, result = client.list_tasks()
+        assert result
+        log.info(f"list tasks response: {res}")
+        num_tasks = len(res["tasks"])
+        assert num_tasks == 0