Abstract: Objective The Jason-2satellite is an altimeter satellite,which means orbit precision must reach cmlevel.Jason-2’s precise orbit is determined from Jason-2’s satellite-borne GPS data using the zero-difference reduced-dynamic method,introduced for the processing of precise orbit determination,itanalyzes the precision of orbit determination.An experiment for precise orbit determination is donewith actual data to compare the overlap orbits from the reduced-dynamic method,the radial accuracyreaches 1.19cm,and result compares with POE provided by CLASS,and analyse the difference inRTN.The study shows that the radial accuracy reaches 5.54cm.Comparing with SLR data,the studyshows that overall accuracy reaches 6.63cm.In general,the accuracy of the computed orbit is at centi-meter level.,and it reaches the required standard.