Abstract:Dynamic gravity variation in the northeastern margin of QinghaiTibet plateau during 1994~1995、2002~2003 and 2011~2012 were decomposed by using multiscale decomposition technique of discrete wavelet.Based on this result,gravity anomalies were mainly analyzed for Yongdeng Ms5.8 earthquake on Jul.22,1995、Minle Ms6.1 earthquake on Oct.25,2003 and Wuwei Ms4.9 earthquake on May.11,2012.The result shows that the three earthquakes are reflected effectively by the 4order detail.Gravity anomalies near the epicenters are more obviously in 4order wavelet details,which appear widely in the dynamic patterns of gravity field.The result is significant for determining the potential seismic rick.