The embodiments of the present application provide a method for sending user subscription data, a method for receiving user subscription data, an HSS, and an SGSN. After receiving a request from an SGSN, the HSS determines whether the user subscription data includes CAMEL service data. If the user subscription data includes the CAMEL service data, the HSS sends the user subscription data to the SGSN by using a Gr interface, or sends non-CAMEL service data in the user subscription data by using the S6d interface and sends the CAMEL service data in the user subscription data by using a Gr interface to the SGSN.