The invention provides a method, a device and a system for realization of restricting businesses, which particularly comprises the steps of: in the process of a session, receiving a subsequent session message of a session initialization request message and executing, in accordance with the parameters in the subsequent session message associated with the restricted businesses, the process of treatment of the businesses. By applying the proposal of the invention, as the subsequent session message of the session initialization request message can be received, the service for restricting the businesses can be provided for a contract terminal by using the subsequent session message to guarantee effectiveness of the bushiness service in the process of the subsequent session, which is in favor of popularization of restricting the businesses.