Based on 1:100 000 high-precision aeromagnetic data,the author holds that Huangzhuguan-Yushuba fault is not only a second order synsedimentary fault associated with Lixian-Mayanhe regional fault in the north,but also a deep fault that cuts the basement.Probably formed in Early Proterozoic,it was rejuvenated repeatedly in late stage.It obviously controls the distribution of the basement stucture and,in addition,evidently governs the subsequent stratigraphic sedimentation,magmatic activity and,especially,the formation and distribution of the Xicheng lead zinc orefield.