Abstract: By using the theories of spheroidal and Spherical harmonic analyses, combining global (including the area of China) 30'×30' mean free-air gravity anomalies as well as GEM T2 model determined by satellite tracking data,the WDM94 model has been determined complete to degree 360. The extern checks show that the accuracy of global 30'×30' gravity anomalies is ±8. 7m Gal,and ±9. 8mGal within China region. For the geoid undulation of China, the accuracy reaches decimetre level.