diff --git a/tests/python_client/milvus_client/test_milvus_client_delete.py b/tests/python_client/milvus_client/test_milvus_client_delete.py
index 489e69749c849..56a4cde46f12c 100644
--- a/tests/python_client/milvus_client/test_milvus_client_delete.py
+++ b/tests/python_client/milvus_client/test_milvus_client_delete.py
@@ -107,7 +107,6 @@ def test_milvus_client_delete_with_invalid_id_type(self):
                                      "err_msg": "expr cannot be empty"})
 
     @pytest.mark.tags(CaseLabel.L1)
-    @pytest.mark.xfail(reason="pymilvus issue 1870")
     def test_milvus_client_delete_with_not_all_required_params(self):
         """
         target: test delete (high level api)
@@ -121,8 +120,8 @@ def test_milvus_client_delete_with_not_all_required_params(self):
         # 2. delete
         client_w.delete(client, collection_name,
                         check_task=CheckTasks.err_res,
-                        check_items={"err_code": 1,
-                                     "err_msg": "expr cannot be empty"})
+                        check_items={"err_code": 999,
+                                     "err_msg": "The type of expr must be string ,but <class 'NoneType'> is given."})
 
 
 class TestMilvusClientDeleteValid(TestcaseBase):
diff --git a/tests/python_client/testcases/test_delete.py b/tests/python_client/testcases/test_delete.py
index 56646ceb94c03..813acd51fbc7b 100644
--- a/tests/python_client/testcases/test_delete.py
+++ b/tests/python_client/testcases/test_delete.py
@@ -108,7 +108,7 @@ def test_delete_expr_none(self):
         """
         # init collection with tmp_nb default data
         collection_w = self.init_collection_general(prefix, nb=tmp_nb, insert_data=True)[0]
-        error = {ct.err_code: 1, ct.err_msg: "expr cannot be None"}
+        error = {ct.err_code: 999, ct.err_msg: "Illegal str variables: {'filter': None}, expect non-empty str"}
         collection_w.delete(expr=None, check_task=CheckTasks.err_res, check_items=error)
 
     @pytest.mark.tags(CaseLabel.L2)
@@ -121,7 +121,8 @@ def test_delete_expr_non_string(self, expr):
         """
         # init collection with tmp_nb default data
         collection_w = self.init_collection_general(prefix, nb=tmp_nb, insert_data=True)[0]
-        error = {ct.err_code: 1, ct.err_msg: f"expr value {expr} is illegal"}
+        error = {ct.err_code: 999, ct.err_msg: "Illegal str variables: {'filter': %s}, expect non-empty str"
+                                               % str(expr)}
         collection_w.delete(expr, check_task=CheckTasks.err_res, check_items=error)
 
     @pytest.mark.tags(CaseLabel.L2)
@@ -312,7 +313,8 @@ def test_delete_non_string_partition_name(self, partition_name):
         collection_w = self.init_collection_general(prefix, nb=tmp_nb, insert_data=True)[0]
 
         error = {ct.err_code: 0,
-                 ct.err_msg: f"partition_name value {partition_name} is illegal"}
+                 ct.err_msg: "Illegal nullable str variables: {'partition_name': %s}, "
+                             "expect None or non-empty str" % str(partition_name)}
         collection_w.delete(tmp_expr, partition_name=partition_name,
                             check_task=CheckTasks.err_res, check_items=error)
 
@@ -2069,7 +2071,7 @@ def test_delete_expr_empty_string(self):
         collection_w = self.init_collection_general(prefix, True)[0]
 
         # delete
-        error = {ct.err_code: 1, ct.err_msg: "expr cannot be empty"}
+        error = {ct.err_code: 1, ct.err_msg: "Illegal str variables: {'filter': ''}, expect non-empty str"}
         collection_w.delete(expr="", check_task=CheckTasks.err_res, check_items=error)
 
     @pytest.mark.tags(CaseLabel.L2)
diff --git a/tests/python_client/testcases/test_partition_key.py b/tests/python_client/testcases/test_partition_key.py
index d630b32691e7f..30b2838204a1e 100644
--- a/tests/python_client/testcases/test_partition_key.py
+++ b/tests/python_client/testcases/test_partition_key.py
@@ -496,7 +496,7 @@ def test_partition_key_insert_invalid_data(self, invalid_data):
         float_vec_values = gen_vectors(nb, ct.default_dim)
         data = [pk_values, int64_values, string_values, float_vec_values]
 
-        err_msg = "expect string input"
+        err_msg = "field (varchar) expect string input"
         collection_w.insert(data, check_task=CheckTasks.err_res, check_items={"err_code": 2, "err_msg": err_msg})