Abstract:Based on gravity observations from 2013 to 2015 of west Tianshan area, and considering regional earthquake catalogue,we analyze the relationship between variation of gravity field and earthquakes in the west Tianshan mountains. The results show that: (1) The west Tianshan area is one of the most active areas in the gravity field. Gravity field change “enhance-weakened-enhance” correspond with seismic trend activity “active-quiet-active”. The change of regional gravity field is related to the north drift rotation of Tarim plate.(2)The epicenter is located in the high gradient zone of gravity variation and is close to the “0” equivalent line. (3) Before the earthquake in the west Tianshan area, the cross-fault section shows a turning image.