A method for subscription service in an IP multimedia subsystem is disclosed. A Session Border Controller (SBC) establishes IP channels between the SBC and an IMS terminal as well as between the SBC and a Resource List Server (RLS) after receiving a status subscribe request message from the IMS terminal; and the RLS sends the status information and an acknowledgment message to the IMS terminal through the IP channels after finding subscribed status information for the IMS terminal. A system for a subscription service in an IP multimedia subsystem network is further disclosed. The IP channels established in the present disclosure to transmit the subscription information on the RLS not only can transmit a great amount of information, but also has higher efficiency of information transmission, as long as the IMS terminal has a capability of processing IP data packets.