diff --git a/python_module/megengine/quantization/fake_quant.py b/python_module/megengine/quantization/fake_quant.py
index da365f16..7260b9db 100644
--- a/python_module/megengine/quantization/fake_quant.py
+++ b/python_module/megengine/quantization/fake_quant.py
@@ -50,17 +50,17 @@ class _FakeQuantize(Module):
     def disable(self):
         self.enabled = False
 
-    def fake_quant_forward(self, inp, q_dict):
+    def fake_quant_forward(self, inp, q_dict=None):
         return inp
 
-    def normal_foward(self, inp, q_dict):
+    def normal_foward(self, inp, q_dict=None):
         return inp
 
-    def forward(self, inp, q_dict):
+    def forward(self, inp, q_dict=None):
         if self.enabled:
-            return self.fake_quant_forward(inp, q_dict)
+            return self.fake_quant_forward(inp, q_dict=q_dict)
         else:
-            return self.normal_foward(inp, q_dict)
+            return self.normal_foward(inp, q_dict=q_dict)
 
 
 class TQT_Function(Function):
@@ -110,11 +110,11 @@ class TQT(_FakeQuantize):
         super().__init__(dtype, narrow_range, enable)
         self.scale = Parameter(0.0, dtype=np.float32)
 
-    def fake_quant_forward(self, inp, q_dict):
+    def fake_quant_forward(self, inp, q_dict=None):
         # when enable, TQT will do fakequant forward, finetune the scale
         return TQT_Function(self.qmin, self.qmax)(inp, self.scale)
 
-    def normal_foward(self, inp, q_dict):
+    def normal_foward(self, inp, q_dict=None):
         if q_dict["enable_observer"]:
             # when disable, TQT will do normal forward, initialize scale weight
             tmp_scale = F.maximum(F.abs(q_dict["min_val"]), F.abs(q_dict["max_val"]))
@@ -123,9 +123,9 @@ class TQT(_FakeQuantize):
         return inp
 
     def get_qparams(self):
-        qdict = get_qparam_dict(QuantMode.TQT)
-        qdict["scale"] = 2 ** self.scale
-        return qdict
+        q_dict = get_qparam_dict(QuantMode.TQT)
+        q_dict["scale"] = 2 ** self.scale
+        return q_dict
 
     def get_dtype(self):
         q_dict = self.get_qparams()
@@ -141,5 +141,5 @@ class FakeQuantize(_FakeQuantize):
     A module to do quant and dequant according to observer's scale and zero_point.
     """
 
-    def fake_quant_forward(self, inp, q_dict):
+    def fake_quant_forward(self, inp, q_dict=None):
         return fake_quant_tensor(inp, self.qmin, self.qmax, q_dict)