diff --git a/qcloud_cos/cos_auth.py b/qcloud_cos/cos_auth.py
index 64e112a8..e2712b37 100644
--- a/qcloud_cos/cos_auth.py
+++ b/qcloud_cos/cos_auth.py
@@ -138,12 +138,13 @@ def __call__(self, r):
 
 class CosRtmpAuth(AuthBase):
 
-    def __init__(self, conf, bucket=None, channel=None, params={}, expire=10000):
+    def __init__(self, conf, bucket=None, channel=None, params={}, expire=3600, presign_expire=0):
         self._secret_id = conf._secret_id
         self._secret_key = conf._secret_key
         self._token = conf._token
         self._anonymous = conf._anonymous
         self._expire = expire
+        self._presign_expire = presign_expire
         self._params = params
         if self._token:
             self._params['q-token'] = self._token
@@ -154,6 +155,8 @@ def get_rtmp_sign(self):
         canonicalized_param = ''
         for k, v in self._params.iteritems():
             canonicalized_param += '{key}={value}&'.format(key=k, value=v)
+        if self._presign_expire >= 60:
+            canonicalized_param += 'presign={value}'.format(value=self._presign_expire)
         canonicalized_param = canonicalized_param.rstrip('&')
         rtmp_str = u"{path}\n{params}\n".format(path=self._path, params=canonicalized_param)
         logger.debug("rtmp str: " + rtmp_str)
diff --git a/qcloud_cos/cos_client.py b/qcloud_cos/cos_client.py
index 590f8c3e..b000d856 100644
--- a/qcloud_cos/cos_client.py
+++ b/qcloud_cos/cos_client.py
@@ -3857,12 +3857,13 @@ def get_async_fetch_task(self, Bucket, TaskId, **kwargs):
         data = rt.json()
         return data
 
-    def put_live_channel(self, Bucket, ChannelName, Expire=3600, LiveChannelConfiguration={}, **kwargs):
+    def put_live_channel(self, Bucket, ChannelName, Expire=3600, PreSignExpire=0, LiveChannelConfiguration={}, **kwargs):
         """创建直播通道
 
         :param Bucket(string): 存储桶名称.
         :param ChannelName(string): 直播通道名称.
         :param Expire(int): 推流url签名过期时间.
+        :param PreSignExpire(int): playlist中ts分片签名的过期时间,合法值[60,43200],默认为0,不开启该签名.
         :param LiveChannelConfiguration(dict): 直播通道配置.
         :param kwargs(dict): 设置请求headers.
         :return(dict): publish url and playurl.
@@ -3900,7 +3901,7 @@ def put_live_channel(self, Bucket, ChannelName, Expire=3600, LiveChannelConfigur
             params=params)
         data = xml_to_dict(rt.content)
         if data['PublishUrls']['Url'] is not None:
-            rtmpSign = CosRtmpAuth(self._conf, bucket=Bucket, channel=ChannelName, expire=Expire)
+            rtmpSign = CosRtmpAuth(self._conf, bucket=Bucket, channel=ChannelName, expire=Expire, presign_expire=PreSignExpire)
             url = data['PublishUrls']['Url']
             url += '?' + rtmpSign.get_rtmp_sign()
             data['PublishUrls']['Url'] = url