Abstract: The 1?/1? free-air anomaly and bouguer anomaly of the Chinese continent can be briefly outlined by 104癊 as a border line separating into the eastern and the western parts, distinctly different in anomaly features. The anomaly change of the former is gentle with a NNE strike of linear anomaly, while the latter's is intensive with a NWW strike of linear anomaly. The further subdivision of Chinese continent gives four anomaly regions, the Eastern, the Central, the Xinjiang and the Qinghai-Xizang, they vary obviously in nature. We discussed the relationships between the regional gravity field and tectonics, isostasy and seismicity. It is suggested that the linear anomalies of the Eastern part reflect mainly the structural system of NNE strike but the Western part reflect the structural system of NWW strike. The Bouguer anomaly gradient zones are coincident with the fault belts between fault blocks, and the Chinese continental crust is principally in an isostatic state on a large scale. Therefore it can be assumed that most of earthquakes would take place along the gravity gradient zones.