Abstract: In this paper we have analyzed the data of deformation, gravity and geomagnetism that control activity of Huangzhuang-Gaoliying fault and Babaoshan fault.It is considered that the fault between Yongdinghe and Liangxiang is the most active one.This fault activity is closely related to the occurrence of strong earthquakes.The region, where Huangzhuang-Gaoliying fault and Babaoshan fault are located, is the sensitive area of stress field variation resulted from seismic activity.It is the region of stress migration and concentration after Datong earthquake and Zhangbei earthquake.The migrated and concentrated partial stress is possibly released slowly in the form of fault creep.

Key words: Huangzhuang-Gaoliying fault, Babaoshan fault, Activity, Stress migration