diff --git a/tests/python_client/base/partition_wrapper.py b/tests/python_client/base/partition_wrapper.py
index 8a99199d51..3230589192 100644
--- a/tests/python_client/base/partition_wrapper.py
+++ b/tests/python_client/base/partition_wrapper.py
@@ -95,3 +95,14 @@ class ApiPartitionWrapper:
                                        params=params, limit=limit, expr=expr,
                                        output_fields=output_fields, **kwargs).run()
         return res, check_result
+
+    def delete(self, expr, check_task=None, check_items=None, **kwargs):
+        timeout = kwargs.get("timeout", TIMEOUT)
+        kwargs.update({"timeout": timeout})
+
+        func_name = sys._getframe().f_code.co_name
+        res, succ = api_request([self.partition.delete, expr], **kwargs)
+        check_result = ResponseChecker(res, func_name, check_task,
+                                       check_items, is_succ=succ, expr=expr,
+                                       **kwargs).run()
+        return res, check_result
diff --git a/tests/python_client/requirements.txt b/tests/python_client/requirements.txt
index 3b94506315..4451e795ef 100644
--- a/tests/python_client/requirements.txt
+++ b/tests/python_client/requirements.txt
@@ -12,7 +12,7 @@ allure-pytest==2.7.0
 pytest-print==0.2.1
 pytest-level==0.1.1
 pytest-xdist==2.2.1
-pymilvus==2.0.1.dev1
+pymilvus==2.0.1.dev3
 pytest-rerunfailures==9.1.1
 git+https://github.com/Projectplace/pytest-tags
 ndg-httpsclient
diff --git a/tests/python_client/testcases/test_partition_20.py b/tests/python_client/testcases/test_partition_20.py
index 7ce1d2f6aa..dca815bc35 100644
--- a/tests/python_client/testcases/test_partition_20.py
+++ b/tests/python_client/testcases/test_partition_20.py
@@ -811,3 +811,36 @@ class TestPartitionOperations(TestcaseBase):
         """
         pass
 
+    @pytest.mark.tags(CaseLabel.L1)
+    @pytest.mark.parametrize("data", [cf.gen_default_list_data(nb=3000)])
+    @pytest.mark.parametrize("index_param", cf.gen_simple_index())
+    def test_partition_delete_indexed_data(self, data, index_param):
+        """
+        target: verify delete entities with an expression condition from an indexed partition
+        method: 1. create collection
+                2. create an index
+                3. create a partition
+                4. insert same data
+                5. delete entities with an expression condition
+        expected: delete successfully
+        issue #15456
+        """
+        # create collection
+        collection_w = self.init_collection_wrap()
+
+        # create index of collection
+        collection_w.create_index(ct.default_float_vec_field_name, index_param)
+
+        # create partition
+        partition_name = cf.gen_unique_str(prefix)
+        partition_w = self.init_partition_wrap(collection_w, partition_name)
+        assert collection_w.has_partition(partition_name)[0]
+
+        # insert data to partition
+        ins_res, _ = partition_w.insert(data)
+        assert len(ins_res.primary_keys) == len(data[0])
+
+        # delete entities with an expression condition
+        expr = "int64 in [0,1]"
+        res = partition_w.delete(expr)
+        assert len(res) == 2