Abstract: A great earthquake (M=7(1/4)) occured near Dingxiang County and Xinzhou City, Shanxi Province, in 1038. Based on a large amount of field research in geeology and geomorphology, the Xizhoushan Fault is confirmed to be the anthquake fault of the disaster. The epicenter is near Shuiyu Village and Yaerkeng Village. Near the epicenter, the earthquake caused hundreds of fandslides in rock mountains and loess hills, which dammed river beds and formed a lot of harrier lakes. Xizhoushan Fault was very active in Holocene. During the last 6200 years, hte velocity of vertical displacement of the fault is 2 mm/year, and at least two earthquakes occurred on the fault.