Provided in the embodiments of the present application are an MBS service configuration method and apparatus, a terminal device, and a network device, the method comprising: a terminal device receives configuration information of an MBS service, the MBS service being transmitted by means of a multicast method, and the configuration information of the MBS service being used for determining at least one of the following: whether the terminal device can receive the MBS service in an RRC_IDLE state and/or an RRC_INACTIVE state; and whether the terminal device needs to implement MBS service feedback.