Method and system for user service registration

The invention discloses a method and a system for user service registration. The method comprises that, after a service server in an application system obtains the user information of a user who customizes service, the service server judges whether the user registers in the application system; if the user does not register in the application system, registration request message is issued to the user; the SIM card of the user analyzes the received registration request message to prompt the user to register; and after the SIM card of the user receives registration confirmation information input by the user, the SIM card initiates the process of service registration to the service server. In the whole registration process, the user is not required to enter the zero-order menu of the SIM card through clicking to actively initiate the registration process but is required only to select registration when the SIM card prompts whether to register, so the user registration process initiated by the service server is realized and the operation on the user side is simplified.