Based on the interpretation of geophysical data in the western margin of Ordos Basin, it is suggested that the formation and evolution of tri-shaped rift formed by Qinling -Qilian -Helan mountains would be the main factor to form south and north large thrusting fault belts in the western edge of Ovdos Basin.

At the same time,tectonic evolution experienced ocean crust diving-collision and intense orogenesis stage,weakly compressing occlude instant volcanic action stage and revived strongly thrust stage,generating many thrust faults to influence sedimentation and denudation and control formation and evolution of thrust belt.