The sea surface heights determined by satellite radar altimetry are easily converted into gravity anomalies. Satellite altimetric data from closely spaced Geodetic Missions of both GEOSATand ERS-1 were combined to achieve the highest resolution gravity coverage over the South China Sea region. Many interesting and previously uncharted features are revealed in this new gravity map including spreading ridge, transform faults, elastic plate thick ness of lithosphere, behaviors of continental margins, and new sedimentary basins.