Abstract: The activity of Hughes using moon gravitation for orbit change of “Asiasat-3” satellite made great sensation in the world.In this pap er,through the concept of effect sphere,explained the theory of orbit inclinatio n changing using gravitation of celestial body is explained.To use this theory,t he orbit and the space position of the celestial body must fulfil certain condit ions.A supposed orbit to show the effect of the moon gravitation on the orbit in clination is also introduced. Subject Term Gravitation transfer-orbital technique Orbit inclina tion Transfer orbital control Communication satellite