The invention relates to a method for the terminal users of cluster communication system to access service, which allocates the access-priorities for the preset service of the described terminals and stores it. When a request for service of the terminal users is launched, the steps show as follow: A,initiating an access-request of the first service for the first terminal users of the first group, B,determining whether the first terminal user of the first group is receiving the second service at the present time, and if so, the step goes to C, if not, the first service is continued for the terminal users of the first group, C,comparing the access-priority of the first service with that of the second, and if the first one is more prior, terminating the second receiving service and continuing the first service for the terminal users of the first group. |