Abstract: The stability analysis methods for composite foundation improved by rigid piles under embankment are imperfect at present. The finite element method is used to analyze the damage process and failure mode of the piles under embankment. Due to the position of piles, there are significant differences between rigid piles to the contribution of embankment stability. The failure modes of piles can be divided into three categories: compression failure, bending failure and tensile failure, and the piles can be classified and partitioned according to their failure modes. Based on the principle of the limit equilibrium methods, the stability analysis method for rigid pile composite foundation under embankment considering the difference of failure modes is put forward and compared with other four kinds of stable analysis methods. It is shown that the results of this method are the closest to those of numerical analysis method, and this method is reasonable and feasible.