In this paper, a force model of frame anti-sliding piles is presented to solve the problem efficiently for its spatial force analyzing techniques, which takes double row anti-slide piles as a single-layer multi-span frame structure composed of piles, beams and soils. A calculation approach for the model is proposed. It decomposes the frame structure into two parts along sliding surface, and deformation equations are rebuilt up correspondingly under pile lead border condition, continuous deformation of strong point, static force balance and deformation coordination between top ring beams and pile leads.