diff --git a/tests/python_client/common/common_func.py b/tests/python_client/common/common_func.py
index 416fc2051a..966932784f 100644
--- a/tests/python_client/common/common_func.py
+++ b/tests/python_client/common/common_func.py
@@ -935,7 +935,10 @@ def gen_invalid_search_param(index_type, metric_type="L2"):
         for search_list in ["-1"]:
             diskann_search_param = {"metric_type": metric_type, "params": {"search_list": search_list}}
             search_params.append(diskann_search_param)
-
+    elif index_type == "SCANN":
+        for reorder_k in [-1]:
+            scann_search_param = {"metric_type": metric_type, "params": {"reorder_k": reorder_k, "nprobe": 10}}
+            search_params.append(scann_search_param)
     else:
         log.error("Invalid index_type.")
         raise Exception("Invalid index_type.")
diff --git a/tests/python_client/testcases/test_search.py b/tests/python_client/testcases/test_search.py
index 7179b7e4e8..012d9bfabe 100644
--- a/tests/python_client/testcases/test_search.py
+++ b/tests/python_client/testcases/test_search.py
@@ -758,8 +758,8 @@ class TestCollectionSearchInvalid(TestcaseBase):
 
     @pytest.mark.tags(CaseLabel.L2)
     @pytest.mark.parametrize("index, params",
-                             zip(ct.all_index_types[1:6],
-                                 ct.default_index_params[1:6]))
+                             zip(ct.all_index_types[1:7],
+                                 ct.default_index_params[1:7]))
     def test_search_different_index_invalid_params(self, index, params):
         """
         target: test search with different index