There are significant differences between the double pile-column foundation and the common pile foundation in abrupt slope. And the bearing capacity and deformation behaviors of double pile-column foundations in abrupt slope are more complex. Simplified models were developed to analyze the bearing mechanism of lengthways and lateral double pile-column foundations in abrupt slope, and were derived using the internal force of common pile subjected to the horizontal uniform force applied on the shaft. The proposed model was verified and its influencing factors were analyzed by a typical engineering project, including pile diameter, sliding body thickness, residual sliding force, proportional coefficient of ground level resistance modulus, on the pile-top horizontal displacement and pile maximum bending moment. The results indicated similar impact by these factors, and salient potential sliding body on the load acting section, and subtle influence of the depth on the load bearing section. Larger pile diameters within 2.5 m are preferred to control the pile deformation and bending moment. Foundation locations can also be changed to reduce the influence of residual sliding force, and lower the instability risk of the pile-column foundation in abrupt slop. The results under different conditions imply optimization design in engineering practices.