diff --git a/imperative/python/megengine/traced_module/node.py b/imperative/python/megengine/traced_module/node.py
index d3c9fcca..e6786406 100644
--- a/imperative/python/megengine/traced_module/node.py
+++ b/imperative/python/megengine/traced_module/node.py
@@ -74,7 +74,7 @@ class Node:
         r"""Set a new name to this Node."""
         graph = self.top_graph
         assert graph is not None, "The parent graph of this Node cannot be None."
-        assert new_name not in graph._namespace.used_names, (
+        assert graph._namespace.used_names.get(new_name, None) is None, (
             "The name(%s) is already in use. Please try a different one again."
             % (new_name)
         )
diff --git a/imperative/python/megengine/traced_module/traced_module.py b/imperative/python/megengine/traced_module/traced_module.py
index 7f6bcb26..b4a7f9b1 100644
--- a/imperative/python/megengine/traced_module/traced_module.py
+++ b/imperative/python/megengine/traced_module/traced_module.py
@@ -544,11 +544,11 @@ class InternalGraph:
         graph = self.top_graph
         assert graph is not None or mod._is_top, "The parent graph cannot be None."
         if graph is not None:
-            assert new_name not in self._namespace.used_names, (
+            assert graph._namespace.used_names.get(new_name, None) is None, (
                 "The name(%s) is already in use. Please try a different one again."
                 % (new_name)
             )
-            new_name = self._namespace.create_unique_name(new_name, self)
+            new_name = graph._namespace.create_unique_name(new_name, self)
         self._name = new_name
 
     @property
@@ -1032,21 +1032,33 @@ class InternalGraph:
                 n.inputs[idx] = repl_node
 
     def _merge_getattr_expr(self):
-        getattr_nodes_map = dict()
-        for expr in self._exprs:
-            if not isinstance(expr, GetAttr):
-                continue
-            attr_name = get_suffix_name(self.qualname, expr.outputs[0].qualname)
-            assert attr_name, '"{}" is not a prefix of "{}"'.format(
-                self.qualname, expr.outputs[0].qualname
-            )
-            if attr_name in getattr_nodes_map:
-                base_node = getattr_nodes_map[attr_name]
+        getattr_nodes_map = dict()  # Dcit[(Node, str), Node]
+        node_to_attrname = dict()  # Dict[Node, (Node, Str)]
+        for expr in filter(lambda x: isinstance(x, GetAttr), self._exprs):
+            base_node, attr_name = expr.inputs[0], expr.name
+            if expr.inputs[0] in node_to_attrname:
+                base_node, base_name = node_to_attrname[expr.inputs[0]]
+                attr_name = "{}.{}".format(base_name, expr.name)
+
+            if get_suffix_name(self.qualname, expr.outputs[0].qualname) != attr_name:
+                expected_qualname = base_node.qualname + "." + attr_name
+                logger.warning(
+                    "{}.qualname expects {}, got {} actually. You can re-trace this "
+                    "TracedModel to make the name correct.".format(
+                        expr.outputs[0], expected_qualname, expr.outputs[0].qualname
+                    )
+                )
+                expr.outputs[0]._qualname = expected_qualname
+
+            key = (base_node, attr_name)
+            node_to_attrname[expr.outputs[0]] = key
+            if key in getattr_nodes_map:
+                existed_node = getattr_nodes_map[key]
                 repl_node = expr.outputs[0]
                 for expr in repl_node.users:
-                    base_node.users.append(expr)
+                    existed_node.users.append(expr)
                     idx = expr.inputs.index(repl_node)
-                    expr.inputs[idx] = base_node
+                    expr.inputs[idx] = existed_node
                 repl_node.users = []
             else:
                 if attr_name != expr.name:
@@ -1054,7 +1066,7 @@ class InternalGraph:
                     expr.inputs[0].users.remove(expr)
                     self.inputs[0].users.append(expr)
                     expr.inputs[0] = self.inputs[0]
-                getattr_nodes_map[attr_name] = expr.outputs[0]
+                getattr_nodes_map[key] = expr.outputs[0]
 
     def compile(self):
         r"""Delete unused expr."""