Abstract: The technique of compound soil nail support structures is developed fast and spread widely in recent years,but there is no appropriate method for analyzing the displacement of it from engineering standpoint.This paper attempts to compute the horizontal displacement of the structure by one dimension finite element method and considering the lag construction of soil nails,and making a discount for active earth pressure due to high concentration of soil nails and action of slope angle.This mehtod is simple,and easily to code in computer program.From case study,the results demonstrate that computed horizontal displacements of the structure approach to the measured data.