Abstract: Based mainly on detailed field geological investigation and a few geophysical surveys while utilizing interpretation of aerial photograph and satellite picture subsidiary, the plane and profile structures of Zhongwei-Tongxin fault zone in the outlet of the Heishan gorge on the Yellow river are studied and hence some results are gained. The Zhongwei-Tongxin fault zone comprises of six secondary faults that are F1,F2,F3,F8(7),F201 and F202 from south to north and strike to east nearly. As for plane structure, the ends of each fault converge at the adjacent one among them and then overlap each other. All faults converge on fault F201.These faults with exception of F3 dip. to south and form a complex active imbricated shrusting nappe.