Abstract: Most of the researches on composite beams with interlayer slips are concentrated on two-layered composite beams, while few works have been done on multi-layered composite beams. In this paper, the gonverning equations are derived for multi-layered composite beams taking into account the slips between layers, the analytical solutions for deflection calculations under uniformly distributed load and simply supported boundary conditions are obtained, and the formula for deflection magnification factor is presented. These solutions can be utilized to engineering applications by conveniently combining with reduced stiffness method.