diff --git a/douzero/dmc/dmc.py b/douzero/dmc/dmc.py
index 37c65fd..f0808fa 100644
--- a/douzero/dmc/dmc.py
+++ b/douzero/dmc/dmc.py
@@ -172,7 +172,7 @@ def train(flags):
             actor = mp.Process(
                 target=act,
                 args=(i, device, batch_queues, models[device], flags))
-            # actor.setDaemon(True)
+            actor.daemon = True
             actor.start()
             actor_processes.append(actor)
 
@@ -209,6 +209,7 @@ def train(flags):
             for position in ['landlord', 'landlord_up', 'landlord_front', 'landlord_down', 'bidding']:
                 thread = threading.Thread(
                     target=batch_and_learn, name='batch-and-learn-%d' % i, args=(i,device,position,locks[device][position],position_locks[position]))
+                thread.setDaemon(True)
                 thread.start()
                 threads.append(thread)