diff --git a/imperative/python/megengine/traced_module/module_tracer.py b/imperative/python/megengine/traced_module/module_tracer.py
index bfe4ea41cb221fc007662825fe73eeda0e1e9fe5..70a020f4863b5ccb70b7407666e753ac1378099e 100644
--- a/imperative/python/megengine/traced_module/module_tracer.py
+++ b/imperative/python/megengine/traced_module/module_tracer.py
@@ -148,7 +148,6 @@ class module_tracer:
         self.checker.push_scope()
         self._activate_constant_cache.append([])
 
-
     def pop_scope(self):
         self._active_scopes.pop()
         self.checker.pop_scope()
@@ -157,7 +156,6 @@ class module_tracer:
             if hasattr(obj, "_NodeMixin__node"):
                 delattr(obj, "_NodeMixin__node")
 
-
     def current_scope(self):
         if self._active_scopes:
             return self._active_scopes[-1]
diff --git a/imperative/python/megengine/traced_module/traced_module.py b/imperative/python/megengine/traced_module/traced_module.py
index 4950a4535020ebc58ce621279637244b0c39c348..670ab7e90306ae2fbe5a613e606a91abe6969398 100644
--- a/imperative/python/megengine/traced_module/traced_module.py
+++ b/imperative/python/megengine/traced_module/traced_module.py
@@ -58,6 +58,7 @@ from ..quantization.observer import (
     SyncMinMaxObserver,
 )
 from ..tensor import Tensor
+from ..utils.max_recursion_limit import max_recursion_limit
 from ..version import __version__
 from .expr import (
     Apply,
@@ -1247,17 +1248,18 @@ class InternalGraph:
         return result
 
     def __deepcopy__(self, memo):
-        if id(self) in memo:
-            return memo[id(self)]
-        cls = self.__class__
-        result = cls.__new__(cls)
-        state = {}
-        memo[id(self)] = result
-        for k, v in self.__dict__.items():
-            if not isinstance(v, weakref.ReferenceType):
-                state[k] = copy.deepcopy(v, memo)
-        result.__dict__.update(state)
-        return result
+        with max_recursion_limit():
+            if id(self) in memo:
+                return memo[id(self)]
+            cls = self.__class__
+            result = cls.__new__(cls)
+            state = {}
+            memo[id(self)] = result
+            for k, v in self.__dict__.items():
+                if not isinstance(v, weakref.ReferenceType):
+                    state[k] = copy.deepcopy(v, memo)
+            result.__dict__.update(state)
+            return result
 
 
 def _get_meth_name(obj, func):
@@ -2359,16 +2361,17 @@ class TracedModule(Module):
         return result
 
     def __deepcopy__(self, memo):
-        cls = self.__class__
-        result = cls.__new__(cls)
-        state = {}
-        memo[id(self)] = result
-        for k, v in self.__dict__.items():
-            if not isinstance(v, weakref.ReferenceType):
-                state[k] = copy.deepcopy(v, memo)
-        result.__dict__.update(state)
-        result._update_ref()
-        return result
+        with max_recursion_limit():
+            cls = self.__class__
+            result = cls.__new__(cls)
+            state = {}
+            memo[id(self)] = result
+            for k, v in self.__dict__.items():
+                if not isinstance(v, weakref.ReferenceType):
+                    state[k] = copy.deepcopy(v, memo)
+            result.__dict__.update(state)
+            result._update_ref()
+            return result
 
 
 def cpp_apply_module_trace(opdef, *args):
diff --git a/imperative/python/test/unit/traced_module/test_trace_module.py b/imperative/python/test/unit/traced_module/test_trace_module.py
index e4441c49f372cf4e8c3e4073874322f3d7349026..d3baf1530347ac01cabbf861afdf1b9204379507 100644
--- a/imperative/python/test/unit/traced_module/test_trace_module.py
+++ b/imperative/python/test/unit/traced_module/test_trace_module.py
@@ -6,7 +6,7 @@ import megengine.functional as F
 import megengine.module as M
 from megengine import Tensor
 from megengine.module.module import Module
-from megengine.traced_module import TracedModule, trace_module
+from megengine.traced_module import TracedModule, enable_expr_checker, trace_module
 from megengine.traced_module.expr import CallFunction
 
 
@@ -58,7 +58,7 @@ class MyModule4(M.Module):
 
 
 def test_trace_module():
-
+    enable_expr_checker()
     x = Tensor(1)
     m1 = MyModule1()
     tm1 = trace_module(m1, x)