diff --git a/pymilvus/client/utils.py b/pymilvus/client/utils.py
index c7c657377..892c53116 100644
--- a/pymilvus/client/utils.py
+++ b/pymilvus/client/utils.py
@@ -1,3 +1,4 @@
+from copy import deepcopy
 import datetime
 import importlib.util
 from datetime import timedelta
@@ -277,7 +278,7 @@ def get_params(search_params: Dict):
     # no more parameters will be written searchParams.params
     # to ensure compatibility and milvus can still get a json format parameter
     # try to write all the parameters under searchParams into searchParams.Params
-    params = search_params.get("params", {})
+    params = deepcopy(search_params.get("params", {}))
     for key, value in search_params.items():
         if key in params:
             if params[key] != value: