Abstract: Abstract: As the limitations of ground orbit system, this paper presents a method of orbit determination of GEO satellite based on GNSS, and designs an orbit determination of GEO satellite software. Combination of orbit determination of GEO satellite characteristics and construction of GNSS, the satellite visibility algorithms and inter-satellite observation model are discussed, integral Filter method is proposed to determine the orbit of geostationary satellite to make use of the advantage of orbit integral and Kalman filter method. Simulation results show that orbit determination of GEO satellite based on GNSS can increase the satellite observations and improve the accuracy of orbit determination. Finally, the paper develops a space-based orbit determination of GEO satellite simulation platform with STK, MATLAB and Visual C++. The outcomes of this paper will provide theoretical reference and ideal simulation tool for the application of Compass on orbit determination of GEO satellite.