diff --git a/python/paddle/fluid/contrib/slim/quantization/imperative/ptq.py b/python/paddle/fluid/contrib/slim/quantization/imperative/ptq.py
index 22c30b3166cee72ff5e52f5d12e7876c540060f6..67b7c1073e42c2a4d7dd8b19f1dd39eab88ae110 100644
--- a/python/paddle/fluid/contrib/slim/quantization/imperative/ptq.py
+++ b/python/paddle/fluid/contrib/slim/quantization/imperative/ptq.py
@@ -140,7 +140,7 @@ class ImperativePTQ(object):
         assert isinstance(
             model, paddle.nn.Layer
         ), "The model must be the instance of paddle.nn.Layer."
-        is_postprocess = config.get('postprocess', False)
+        is_postprocess = config.get('postprocess', True)
         config.pop('postprocess', None)
 
         # Convert and save dygraph quantized model