Abstract: Abstract: According to the results of magnetotelluric sounding of the Huapi-Zhaizhangzi profile in northern Hebei, the variation patterns of the strata with different electric characters have been distinguished along the profile, the basement relief form determined and the location of fault distribution inferred. Along the profile there are three local buried structures, namely, the Puhe structure, Tazishan structure and Zhaizhangzi structure, of which the Puhe and Zhaizhangzi structures have petroleum prospects. The Tanba-Xiaoxigou fault and Shuangdong South fault are structurally controlling faults, which divide the profile into three down-faulted areas; the Beidian-Taitoushan fault is a large west-dipping reverse fault; the Changzhougou Formation is thrust over the Wumishan Formation, with a displacement of nearly 4000m.