Abstract：The energy conservation approach used for simultaneously resolving bias，scale factor，bias drift and potential coefficients based on LEO （low earth orbit）orbit data and nongravitational accelerometer data is presented.The approach does not require any initial values of unknown parameters and the influence of a prior gravity field model can be avoided.A gravity field model up to degree and order 89 named SWJTUGRACE01 is recovered from 102 days data of GRACE satellite.The model is compared with international model EGM96，EIGEN2，EIGENCHAMP03S，GGM02S and EIGENCG01C.The results show that the model SWJTUGRACE01 is more accurate than the model EGM96，EIGEN2 and EIGENCHAMP03S in the same degree and order and has almost the same accuracy as GGM02S in the low degree and order.
