There is a thick salt layer in the western Kuqa Depression. The tectonic activities during the late Himalayan made the Tianshan orogeny advance southward and the salt body in the front edge of the Kuqa foreland fold-thrust belt emerged to the earth's surface. Tense folding and thrusting happened to the stratum of this place. So, the calculation of the distance that regional geological bodies moved southward should refer not only to the amount calculated from the balanced-section technique, but also the sliding distance of the upper body as a result of the plastic feature of the salt layer. Through both methods of balanced-section technique and physical modeling, the amount of the stratum's shortening (24.5 km) and the southward sliding distance (3.969~14.727 km) of the upper body are worked out, and then we know the displacement of the thrust (18.5~39.227 km) in the western Kuqa Depression.