应用中国地壳运动观测网络工程获得的1998～2005年4期重力场变化观测资料,结合EGM2008的重力场模型作为区域背景场。对2008年新疆于田M_S7.3地震前的重力场变化特征进行深入分析,通过位场延拓和空间求导等方法,对震前的质源体边界特征进行跟踪和估定。同时,尝试利用一种应用空间相关性加权分析方法给出地震危险性空间概率性分布估计。 Based on the observation data of gravitational field changes from 1998 to 2005 obtained from China Crustal Movement Observation Network Project and the gravity field model of EGM2008 as the regional background field, The characteristics of the gravitational field before the M_S7.3 earthquake in Yutian, Xinjiang in 2008 are analyzed in detail. The boundary features of the source bodies before the earthquake are tracked and evaluated through the methods of field extension and space derivation. At the same time, we try to give an estimate of the probability distribution of seismic hazard space by using a method of spatial correlation weighted analysis.