The invention discloses a call setup method applying to a UMA network. The invention is characterized in that according to the division of user level in the UMA network and the determination of call level based on the user level in a process of the call setup, wireless resource is distributed for a calling MS and a called MS according to the determined call level. Thereby, a normal communication of the user with a higher level is guaranteed firstly, and the goal that different services are provided for users with different levels is achieved.