diff --git a/core/model.py b/core/model.py
index bb2040e44458d5a402d54bfc780ae501c9c9d06d..e96d01fe0bbcc0541a2b5aea458e2cb34fa89303 100755
--- a/core/model.py
+++ b/core/model.py
@@ -138,9 +138,7 @@ class ModelBase(object):
             os.environ["FLAGS_communicator_is_sgd_optimizer"] = '0'
 
         if name == "SGD":
-            reg = envs.get_global_env("hyper_parameters.reg", 0.0001)
-            optimizer_i = fluid.optimizer.SGD(
-                lr, regularization=fluid.regularizer.L2DecayRegularizer(reg))
+            optimizer_i = fluid.optimizer.SGD(lr)
         elif name == "ADAM":
             optimizer_i = fluid.optimizer.Adam(lr, lazy_mode=True)
         elif name == "ADAGRAD":