diff --git a/paddlehub/common/lock.py b/paddlehub/common/lock.py
index 814b834f20d2f8008069aafdc52564e4a3453537..6740eb409e73c26542351d349b94060dff63e521 100644
--- a/paddlehub/common/lock.py
+++ b/paddlehub/common/lock.py
@@ -31,6 +31,7 @@ class Lock(object):
         if cmd == self.lock.LOCK_UN:
             Lock._owner = None
             self.lock.flock(fp, cmd)
+            fp.close()
         elif cmd == self.lock.LOCK_EX:
             if Lock._owner is None:
                 Lock._owner = os.getpid()