Abstract：The correlation between crustal deformation in SichuanYunnan region and Kunlun Mountain \%M\%s8.1 earthquake was analyzed by use of GPS data.The results showed that there is good correlation between the displacements at a part of GPS stations in SichuanYunnan area and at stations around the epicenter of the Kunlun Mountain Ms 8.1 earthquake.At the same time, the spacetime process of deformation field of the Kunlun Mountain Ms8.1 earthquake in this region was analyzed with the principal component analysis (PCA). The conclusion are as follows. The deformation caused by Ms8.1 earthquake is extensive, whose affect is mostly NS displacement. The affected area are mostly in Northwest Sichuan block, specially near its south boundary such as Eryuan faults and Xiaojinhe faults, but,there is almost no effect in midYunnan block. The effect weakens obviously in the north and east areas of SichuanYunnan block.An obvious deformation boundary appears in the east boundaries of SichuanYunnan block,but little deformation difference appeares in its west boundaries (Lancangjiang faults). The deformation caused by Kunlun Mountain strong earthquake probably transfer to the southeast words along the arc shearing tectonic faults, mainly along the east boundaries of SichuanYunnan block.
