Contracted service processing method and system and gateway

A subscription service processing method, gateway and system are provided by the embodiment of the present invention. The subscription service processing method includes: a gateway receives packets (11); when determining that the user the packets belong to is a subscription user, the gateway obtains, according to the user subscription information, the forwarding path information of the packets, wherein, the forwarding path information includes the path information on all the intermediate network elements the packets will reach in turn (12); the gateway transmits the packets including the forwarding path information to the intermediate network elements according to the forwarding path information, so that the intermediate network elements can process the packets (13). The intermediate network elements perform the processing in turn, transmit the path information, in which the addresses of their own are deleted, to the next network elements. The embodiment of present invention avoids the shortcoming that multiple processing to the same packet are required when the gateway processes the packets of the subscription user, improves the networking arrangement of intermediate processing network elements, therefore improving the gateway performance.