Abstract: In recent years,successively ground motion in the xian,region has aroused extensive scientistific interest.Based on the relationship between the time series of dislacation in vertical,horizontal and extensional derections,and the time series of various factors in the same period,using a regression analysis.It is found that the motion of Xian ground fissure in the study region is not only confined by geoteetonics but also related intensive decline of confined groundwater.This paper will bring us a new approach to the study of ground fissures in the xian region.