In terms of the range of sliding mass resulting in landslide thrust on stabilizing piles， firstly， this paper established the range of soil-arching effect of sandy-slope behind anti-slide piles based on the pole point theory of Mohr's circle. Moreover， on the basis of Coulomb's theory， the analytical solutions for Coulomb's coefficient of active earth pressure considering the influence of slope angle and lateral stress nearby pile sides with consideration of soil-arching effect were obtained. Furthermore， the analytical solutions for distributed model and resultant force of landslide sliding force acting on anti-slide piles were obtained by adopting the improved solution of the theory of partial plastic deformation which takes account of soil-arching effect. Success of the proposed methods in this paper is illustrated by good comparison with the results of available analytical approach and numerical simulation，which verifies the correctness of the derived Coulomb′s coefficient of active earth pressure considering the influence of slope angle and analytical solution for landslide thrust on anti-slide pile. Finally，the performed parametric study on landslide thrust reveals that landslide thrust and corresponding resultant force increase with the increasing slope angle β， internal friction φ and decreasing the ratio of D1/d.