diff --git a/paddlecloud/notebook/tls.py b/paddlecloud/notebook/tls.py
index 589b7213..f723d68e 100644
--- a/paddlecloud/notebook/tls.py
+++ b/paddlecloud/notebook/tls.py
@@ -36,6 +36,9 @@ def create_user_cert(ca_path, username):
         %s/%s.csr -subj \"/CN=%s\""%\
         (user_cert_dir, username,
         user_cert_dir, username, username))
+    # FIXME(gongwb):why need delete ca.srl when mount afs path while not need
+    # when mount hostpath?
+    user_cert_cmds.append("rm -f %s/ca.srl" % settings.USER_CERTS_PATH)
     user_cert_cmds.append("openssl x509 -req -in %s/%s.csr -CA %s -CAkey %s \
         -CAcreateserial -out %s/%s.pem -days 365"% \
         (user_cert_dir, username,