Abstract: Generally,it is impossible to determine the kinetic states of satellite only by twoGEOSTAR's tracking distance data.In order to do this work,some accessory information must be given,forexample several measurement data and dynamic model of satellite.The mathematical principle of GEOSTARsystem for orbit determination is analyzed.By applying range measurement data fusion and integrating thedynamic model,the trajectory of the user satellite was achieved.Simultaneously,the transfer relation of er-ror was put forward.This method doesn't need the referenced orbit of satellite,so it is very convenient.Theoretical analysis and simulation calculation prove that this method is more feasible and precise.