Global Navigation Satellite System Ground Monitor Station is an significant constitute of the Ground Operating and Controlling System, whose main purpose is to continuously monitor and measure the satellite signal by the monitor receiver, and transmit these monitoring data and the weather data which are used in system precision confirming orbit, ionosphere correction and integrity judgment to the master station by satellite communication or ground communication. Comparing with the ground communication, satellite communication is more maneuverable, flexible, and unrestricted with geographical location and distance, so it is used widely. This paper introduces the design of Satellite Communication subsystem of the Ground Monitor Station for a Global Navigation Satellite System.