A method, a system, and a network element for service processing after data of a network element is invalid or a network element fails are provided. When the service network element (1) receives the service request message from the network and initiated to a called end and the user data is invalid, the service network element (1) returns a data invalid message of the called end to the network. When a network element containing registration data of a user is abnormal and the registration data of the user is invalid, by using the present invention, the service unavailable time is shortened, and user services can be recovered rapidly.