diff --git a/paddleslim/common/rl_controller/__init__.py b/paddleslim/common/rl_controller/__init__.py
index da8158882bd7764b57247a522e2bfb38c4960d7c..b29c563781d1867c38e071f8996835438e9c7fad 100644
--- a/paddleslim/common/rl_controller/__init__.py
+++ b/paddleslim/common/rl_controller/__init__.py
@@ -19,9 +19,7 @@ try:
     import parl
     from .ddpg import *
 except ImportError as e:
-    _logger.warn(
-        "If you want to use DDPG in RLNAS, please pip install parl first. Now states: {}".
-        format(e))
+    pass
 
 from .lstm import *
 from .utils import *
diff --git a/paddleslim/nas/rl_nas.py b/paddleslim/nas/rl_nas.py
index a7fa6591c06385ca8de33131f5c30559617e224a..1718b8347def79a222c7dc016b2a2d021d380f36 100644
--- a/paddleslim/nas/rl_nas.py
+++ b/paddleslim/nas/rl_nas.py
@@ -76,6 +76,15 @@ class RLNAS(object):
         self.save_controller = save_controller
         self.load_controller = load_controller
 
+        if key.upper() in ['DDPG']:
+            try:
+                import parl
+            except ImportError as e:
+                _logger.error(
+                    "If you want to use DDPG in RLNAS, please pip install parl first. Now states: {}".
+                    format(e))
+                os._exit(1)
+
         cls = RLCONTROLLER.get(key.upper())
 
         server_ip, server_port = server_addr