diff --git a/python/paddle/fluid/tests/unittests/test_bpr_loss_op.py b/python/paddle/fluid/tests/unittests/test_bpr_loss_op.py
index d137f4a6fbe4953618a0c355d224a78407482a43..80916f4a8287f576142f141eeb88ed2bb5f32cbb 100644
--- a/python/paddle/fluid/tests/unittests/test_bpr_loss_op.py
+++ b/python/paddle/fluid/tests/unittests/test_bpr_loss_op.py
@@ -25,7 +25,7 @@ class TestBprLossOp1(OpTest):
 
     def setUp(self):
         self.op_type = "bpr_loss"
-        batch_size = 4
+        batch_size = 40
         class_num = 5
         X = randomize_probability(batch_size, class_num, dtype='float64')
         label_pos = np.random.randint(