diff --git a/python/paddle/fluid/contrib/slim/tests/qat_int8_image_classification_comparison.py b/python/paddle/fluid/contrib/slim/tests/qat_int8_image_classification_comparison.py
index 0a0359dc6e32ca996db3385a3098795c14b2706d..24ec7c79769df98e79fd0d712e636921bc9b9d34 100644
--- a/python/paddle/fluid/contrib/slim/tests/qat_int8_image_classification_comparison.py
+++ b/python/paddle/fluid/contrib/slim/tests/qat_int8_image_classification_comparison.py
@@ -57,8 +57,9 @@ def parse_args():
     parser.add_argument(
         '--batch_num',
         type=int,
-        default=1,
-        help='Number of batches to process. 0 or less means all.')
+        default=0,
+        help='Number of batches to process. 0 or less means whole dataset. Default: 0.'
+    )
     parser.add_argument(
         '--acc_diff_threshold',
         type=float,
diff --git a/python/paddle/fluid/contrib/slim/tests/qat_int8_nlp_comparison.py b/python/paddle/fluid/contrib/slim/tests/qat_int8_nlp_comparison.py
index b6eb825b09d2c0aad0d45049feafc09106d1e8c7..d51db0db08472450e824b08f73363cb6734198c3 100644
--- a/python/paddle/fluid/contrib/slim/tests/qat_int8_nlp_comparison.py
+++ b/python/paddle/fluid/contrib/slim/tests/qat_int8_nlp_comparison.py
@@ -57,8 +57,9 @@ def parse_args():
     parser.add_argument(
         '--batch_num',
         type=int,
-        default=1,
-        help='Number of batches to process. 0 or less means all.')
+        default=0,
+        help='Number of batches to process. 0 or less means whole dataset. Default: 0.'
+    )
     parser.add_argument(
         '--acc_diff_threshold',
         type=float,