diff --git a/deepmd/pt/model/model/__init__.py b/deepmd/pt/model/model/__init__.py
index 1675215d7b..b813a06eb6 100644
--- a/deepmd/pt/model/model/__init__.py
+++ b/deepmd/pt/model/model/__init__.py
@@ -138,6 +138,7 @@ def get_zbl_model(model_params):
 
 
 def get_standard_model(model_params):
+    model_params_old = model_params
     model_params = copy.deepcopy(model_params)
     ntypes = len(model_params["type_map"])
     # descriptor
@@ -167,7 +168,7 @@ def get_standard_model(model_params):
         atom_exclude_types=atom_exclude_types,
         pair_exclude_types=pair_exclude_types,
     )
-    model.model_def_script = json.dumps(model_params)
+    model.model_def_script = json.dumps(model_params_old)
     return model