Abstract: Satellite broadband communications have become one of hot issues. The existing satellite wireless access standard DVB-RCS is concentrated on physical layer technique criterions, however, a systemic framework of satellite broadband access system has not been proposed. This paper analyzes requirements and characteristics of satellite broadband access system, and a functional framework of which is also proposed based on the DVB-RCS standard and WiMAX terrestrial broadband access technique. Furthermore, the designing and realization methods of main functions of this proposed framework are researched.