diff --git a/tests/python_client/chaos/test_chaos_memory_stress.py b/tests/python_client/chaos/test_chaos_memory_stress.py
index d320c3ae7940079fef85f3081551027847b2d4f4..8c53cefade2e999475d1fdb470d902f7e17af0e8 100644
--- a/tests/python_client/chaos/test_chaos_memory_stress.py
+++ b/tests/python_client/chaos/test_chaos_memory_stress.py
@@ -1,5 +1,7 @@
+import random
 import threading
-from time import sleep, time
+import time
+from time import sleep
 
 import pytest
 import datetime
@@ -43,13 +45,13 @@ class TestChaosData:
     def test_chaos_memory_stress_querynode(self, connection, chaos_yaml):
         """
         target: explore query node behavior after memory stress chaos injected and recovered
-        method: 1. create a collection, insert some data
-                2. inject memory stress chaos
-                3. load collection and search, query
-                4. todo (verify query node response)
-                5. delete chaos or chaos finished
-                6. release and reload collection, verify search and query is available
-        expected: after chaos deleted, load, search and query are all available
+        method: 1. Create a collection, insert some data
+                2. Inject memory stress chaos
+                3. Start a threas to load, search and query
+                4. After chaos duration, check query search success rate
+                5. Delete chaos or chaos finished finally
+        expected: 1.If memory is insufficient, querynode is OOMKilled and available after restart
+                  2.If memory is sufficient, succ rate of query and search both are 1.0
         """
         c_name = 'chaos_memory_nx6DNW4q'
         collection_w = ApiCollectionWrapper()
@@ -57,22 +59,43 @@ class TestChaosData:
         log.debug(collection_w.schema)
         log.debug(collection_w._shards_num)
 
-        # apply memory stress
-        # apply_memory_stress(chaos_yaml)
-
+        # apply memory stress chaos
+        chaos_config = gen_experiment_config(chaos_yaml)
+        log.debug(chaos_config)
+        chaos_res = CusResource(kind=chaos_config['kind'],
+                                group=constants.CHAOS_GROUP,
+                                version=constants.CHAOS_VERSION,
+                                namespace=constants.CHAOS_NAMESPACE)
+        chaos_res.create(chaos_config)
+        log.debug("chaos injected")
+        duration = chaos_config.get('spec').get('duration')
+        duration = duration.replace('h', '*3600+').replace('m', '*60+').replace('s', '*1+') + '+0'
+        meta_name = chaos_config.get('metadata').get('name')
         # wait memory stress
-        # sleep(constants.WAIT_PER_OP * 2)
-
-        # query
-        collection_w.release()
-        collection_w.load()
-        term_expr = f'{ct.default_int64_field_name} in [0, 1, 999, 99]'
-        for i in range(4):
-            t0_query = datetime.datetime.now()
-            query_res, _ = collection_w.query(term_expr)
-            tt_query = datetime.datetime.now() - t0_query
-            log.info(f"{i} query cost: {tt_query}")
-            assert len(query_res) == 4
+        sleep(constants.WAIT_PER_OP * 2)
+
+        # try to do release, load, query and serach in a duration time loop
+        try:
+            start = time.time()
+            while time.time() - start < eval(duration):
+                collection_w.release()
+                collection_w.load()
+
+                term_expr = f'{ct.default_int64_field_name} in {[random.randint(0, 100)]}'
+                query_res, _ = collection_w.query(term_expr)
+                assert len(query_res) == 1
+
+                search_res, _ = collection_w.search(cf.gen_vectors(1, ct.default_dim),
+                                                    ct.default_float_vec_field_name,
+                                                    ct.default_search_params, ct.default_limit)
+                log.debug(search_res[0].ids)
+                assert len(search_res[0].ids) == ct.default_limit
+
+        except Exception as e:
+            raise Exception(str(e))
+
+        finally:
+            chaos_res.delete(meta_name)
 
     @pytest.mark.tags(CaseLabel.L3)
     @pytest.mark.parametrize('chaos_yaml', get_chaos_yamls())