Abstract: In view of the scarcity of evaluation formula for liquefaction in the gravel pile composite foundation， this paper presents an evaluation method for the liquefaction in the gravel pile composite foundation， which is based on thinking that the distribution of the seismic shear stress is in accordance with the stiffness of the gravel piles and soil， and Seed′s method and USA NCEER method. A finite element numerical simulation method has been used to simulate the changs in the seismic shear stress in the condition of the gravel pile composite foundation and soil foundation. Simulation analysis results show that the seismic shear stress of the gravel pile composite foundation is greater than the seismic shear force of the soil foundation， which means that the gravel piles which have greater stiffness distribute greater seismic shear stress， and that soil distributes the smaller seismic shear stress because its stiffness is smaller than the gravel piles. In addition， the comparison among the simulated results given by the finite element method， the evaluated results given by the method of this paper and the evaluated results given by the method of Chinese Code for Seismic Design of Buildings is made in this study， and the comparison results show that the method presented by this paper is reasonable in evaluating the liquefaction in the gravel pile composite foundation.