A method and a system for preventing a crosstalk of color ring back tone are provided. When a plurality of entities in the network provide a color ring back tone service for a call simultaneously, an Application Server determines whether a ring back tone or prompt tone of a called party needs to be screened according to a predefined strategy. If the ring back tone or prompt tone of the called party needs to be screened, the Application Server screens the ring back tone played by the called party according to service logic and plays a ring back tone provided by the value-added service to the calling user. An Application Server is also provided.