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The geostationary orbit satellite is relative to the earth, it has been widely used in more and more applications,such as earth-observation,weather and comunication, the required precision of the GEO satellite orbit has become more and more accurate, so the research on GEO orbit determination has become extremely urgent. In traditional method, the ground station is used to realize the orbit determination of GEO satellite, there is a problem that the observation geometry among the GEO satellite and MEO satellites is weak, it leads to the result that the error of satellite-ground station observation will be amplified too much. The visible MEO satellite is few and the signal is weak when using GPS to determine the orbit of GEO The Inter-Satellite Link (ISL) whose observation geometry is much better, it has opened up new method to realize the orbit determination of GEO satellite. To solve the limited ISL source problem, three source allocation strategies have been put forward to determine the group of MEO satellites in this paper, the precision and accuracy of the algorithm is verified by simulation data. The result shows that the iteration strategy ensures the accuracy of GEO satellite orbit in 7m~40m and increases the coefficient of ISL about 5~120 times simultaneously.