Abstract: To overcome the problems of destination gateway far away from users, slow synchronization and low transmission efficiency of large geo-synchronous Earth orbit (GEO) satellite system, an Internet access system with large capacity based on multi-beam antenna GEO satellite was proposed. It employed onboard non-regenerating processing, baseband program-controlled circuit switching, close-loop synchronization controlling, signaling processing, channel scheduling, and the time division multiplexing transmission scheme in the downlink. For a large number of distributed or mobile users to access the Internet, the proposed scheme can provide better quality of service and higher ratio of channels utilization; meanwhile, the user capacity and data throughput will become greater in practical running. The simulation results show that multi-frequency quasi-orthogonal time division multiplexing has a better performance and the scheme is feasible according to our similar field programmable gate array design experience.