diff --git a/dpdata/plugins/deepmd.py b/dpdata/plugins/deepmd.py
index 38eab85fd..51fd4667a 100644
--- a/dpdata/plugins/deepmd.py
+++ b/dpdata/plugins/deepmd.py
@@ -394,8 +394,10 @@ def label(self, data: dict) -> dict:
         type_map = self.dp.get_type_map()
 
         ori_sys = dpdata.System.from_dict({"data": data})
+        ori_sys_copy = ori_sys.copy()
         ori_sys.sort_atom_names(type_map=type_map)
         atype = ori_sys["atom_types"]
+        ori_sys = ori_sys_copy
 
         if not self.enable_auto_batch_size:
             labeled_sys = dpdata.LabeledSystem()