Analysing the factors by which gravity anomalies were arised in actual measurements,gravity anomalies caused by underground density contrast and latitude could be calculated by global geopotential model, and anomalies caused by terrain and bouguer plate could be calculated by digital elevation model.

The comparison of the earth gravity field model based on the observed data from CHAMP satellite and energy conservation theory with EGM96 gravity field model shows that CHAMP satellite .

As one of the most active areas of research of the physical geodesy, the accuracy and resolution of the earth gravity field model has achieved a major breakthrough, especially on the improvement of the ground and the air of gravity measurement techniques, and new methods of satellite gravity measurements realized.

A generalized torus spherical harmonic analysis method for the recovery of an Earth gravity field model using gravity observations up to the second order components of the disturbing gravity gradient tensor is studied.

By using of GEODYNⅡ from GSFC/NASA/USA and newly lunar gravity model LP165P from JPL/NASA/USA,the effects on the orbit revolutionary from different models by truncation to some degree and order are simulated and computed,the orbit revolutionary and analysis of orbital lifetime under different height,inclination and ellipticity with same lunar gravity model are computed.

The satellite-ground double differential phase observation of onboard GPS is given to determine the earth gravity model from GPS phase data onboard CHAMP and observations of 48 IGS tracking sites.

With Chinese latest global gravity field model WDM94, the author provides the geoid height and mean free air gravity anomaly of Antarctic(The range of latitude is from -60° to -90°).