diff --git a/imperative/python/megengine/traced_module/traced_module.py b/imperative/python/megengine/traced_module/traced_module.py
index 591b60d3f66c1270922903a84f6287e45ee7cbf4..8f5b3ce8dbb92d4f404b36359fcbdacf6d44b026 100644
--- a/imperative/python/megengine/traced_module/traced_module.py
+++ b/imperative/python/megengine/traced_module/traced_module.py
@@ -1122,16 +1122,25 @@ class InternalGraph:
         self.__dict__.update(state)
 
         if old_version:
+            self.inputs[0]._qualname = self._qualname
+            for e in self.exprs(False):
+                if isinstance(e, GetAttr):
+                    e.outputs[0]._qualname = "{}.{}".format(
+                        e.inputs[0]._qualname, e.name
+                    )
+
             for n in self.nodes(False):
-                qualname = self._qualname
                 if isinstance(n.expr, CallMethod) and isinstance(
                     n.expr.inputs[0], ModuleNode
                 ):
                     n._qualname = n.expr.inputs[0]._qualname + ".[out]"
                     continue
-                if n._qualname:
-                    qualname = "{}.{}".format(qualname, n._qualname)
-                n._qualname = qualname
+                if (
+                    not isinstance(n.expr, GetAttr)
+                    and isinstance(n, TensorNode)
+                    and n._qualname
+                ):
+                    n._qualname = "{}.{}".format(self._qualname, n._qualname)
             self._namespace = NameSpace(self._name, self._qualname)
             self._re_associate_name()
 
@@ -2080,8 +2089,10 @@ class TracedModule(Module):
 
             node2obj[graph._inputs[0]] = module
             prefix_name = call.inputs[0]._name if call else ""
-            exprs = []
+            flattened_exprs = []
+
             for expr in graph._exprs:
+                exprs = [expr]
 
                 if call is not None:
                     _replace_inputs_and_outputs(expr, repl_dict)
@@ -2102,10 +2113,7 @@ class TracedModule(Module):
                             else None
                         )
                         if expr_graph is not None:
-                            exprs.extend(
-                                _flatten_subgraph(graph, expr_graph, expr, obj)
-                            )
-                            continue
+                            exprs = _flatten_subgraph(graph, expr_graph, expr, obj)
 
                 if parent_graph is not None:
                     for node in expr.outputs:
@@ -2116,13 +2124,13 @@ class TracedModule(Module):
                             name, node
                         )
 
-                exprs.append(expr)
+                flattened_exprs.extend(exprs)
 
             if call is not None:
                 for i in call.inputs:
                     i.users.remove(call)
 
-            return exprs
+            return flattened_exprs
 
         new_module.graph._exprs = _flatten_subgraph(
             None, new_module.graph, None, new_module