An improved finite bar element method was developed to analyze the bridge double-piles in high and steep cross slopes based on the characteristics of their bearing capacity. Firstly, an analysis model of double-piles was derived after thoroughly analyzing their bearing mechanism and deformation characteristics. Secondly, the relationship between the residual sliding forces of back pile and front pile was obtained according to the relative position of slope and double-piles. Thirdly, a method was proposed to correct the element stiffness matrix on the basis of general finite element method and mechanics characteristic of piles in high and steep slopes, taking the influence of the “P-Δ” effect and the pile-soil interaction into account, and a corresponding computation program was compiled on the platform of MATLAB. Lastly, a laboratory model test was carried out to verify the validity of the method in this paper, and a design flow chart was proposed. The results show that the computed results are in good agreement with the measured results in model test, thus offering experience for similar engineering.