The present disclosure provides an adaptation, shunt transmission and stream switching method and system for a coordinated service, and the method includes: a request message for service transmission is received from a terminal group; user context information, terminal context information and service context information are acquired according to the request message, and a service adaptation strategy and a service shunt strategy are established; the service adaptation strategy and the service shunt strategy are implemented, adaptation of the coordinated service is completed, and a shunt transmission of the coordinated service is performed; and during the shunt transmission, when a stream switching triggering condition is determined according to acquired network context information and terminal context information, the service shunt strategy and/or the service adaption strategy are updated according to a corresponding stream switching type, and a transmission path of a service stream is redirected. The present disclosure supports the implementation of stream switching, and provides a high-efficient service transmission and presentation service for individualized user service needs.