In view of the complex and difficulty in the detection of piedmont buried faults, the Weishan-Changshan south slope fault was taken as an example in this paper. Combined with data of composite drilling geological section, the accurate location and activity of the buried section of the Weishan-Changshan south slope fault were studied by using shallow seismic exploration, high-density electrical exploration, and other geophysical methods, and the accurate location and occurrence of the fault were determined. The study results showed that the buried segment of Weishan-Changshan south slope fault in Tangshan city behaves as a south-dipping normal fault with an inclination of about 78ånd a fault distance of about 3 m, and the up-breakpoint of the fault is at depth of about 19 m. The buried segment of the fault in Tangshan city is a middle Pleistocene fault, and not active since the late Pleistocene.