Abstract: In this papcr, the ground displacemcnt in Fuzhuang and Mang-hanghc area are analy-sed, and the characteristics of ground motion of Hangu in Pangshan earthquake and its relantion with the geological structure and seismic activ ties are discussed, Meanwhile, it is pointed out that, by using the difference of mechanical property of groung motion in local area, it is significant to study regional stress field in North China.