Abstract: Orbit maintenance is one of very important operation tasks for geostation-ary satellites as well as earth resource satellites.In the case of geostationary orbit the satellites as well as earth resource satellites.In the case of geostationary orbit the satellite position on Earth equator will drift because the perturbation caused by Earth equator ellipticity and the control needs to be performed periodically.In the case of earth resource satellite the atmosphere drag can also cause the ground tracks drift and raising semi-major axis becomes a routine work.In addition,if the orbit is sun-synchronous one,the sun gravitation can effect the inclination and induce the drift of the right ascension of ascending node.Although physical mechanisms to cause the variations are different for different cases,the same mathematical model could be abstracted.The mathematical model for all the cases is presented first,then applications for different situations are described.