Relationship between the dynamic anomalies of groundwater in northern part of North China as well as dynamic anomalies of oil wells in Liaohe,Dagang,Shengli and Huabei oil fields and local structures is studied.The results show anomalous shapes of groundwater and dynamics of oil wells before earthquakes are not only related to the regional structures,but also closely related to local structures.The anomalies are positive in upheaval area and are negative in depression area.