A method for providing service functions includes: the service provider side receives a service request from the service requestor side, screens service functions requested by the service request and forms a service request result, and sends the service request result to the service provider side. A system for providing service functions includes: a service server on the service provider side, adapted to return the requested service to the service requestor side, according to the service request of the service requestor side; a function screener, connected to the service server on the service provider side and adapted to screen service functions requested by the service request and send the after-screening result to the service server on the service provider side. With the present invention, it is possible to control and screen functions of a service dynamically in real time without affecting the network performance.