The magnetotelluric sounding results show that electrical structure inside Ordos massif is simple and clearly layered, the top of the first high conductivity layer of upper mantle is about 109 km deep and there is no crustal high conductivity layer. Near Daluoshan, there exist a few electrical layers within crust. These layers are not linked between the MT sites because crust is broken by fault zones. In this place, the first high conductivity layer of upper mantle is uplifted and its top is about 92 km deep. Through analysis, it is considered that on the east side of Mt. Daluoshan there is a deep-seated fault zone which is the west boundary of Ordos block.