Abstract: Gravity sliding structures are widespread.This paper deals with the study of the mechanism of formation of the nappe at Klamayi and Xiazijie in an attempt to shed some light on the oil possibilities of the region.The author holds that under the force of gravity,the Klamayi-Xiazijie nappe can maintain its equilibrium only when the lateral sliding force is equal to or less than the resistance at the sliding surface.The height of the nappe plays an important role,not the angle of the initial slope.In explaining the formation of the nappe in question,emphasis is laid mainly on the mode of gravity sliding.The nappe is a gravity sliding body of the klippe type,with two rows of well-developed Iolds at its front end.The graben valley through which flows the Dalbute River and the Shentuologe basin are the pull-apart parts of its tail.