Abstract：Based on the model of pore pressure increment of soil and the data of dynamic triaxial test of soil，the seismic response analysis of liquefaction ground is made for the roadbed of railroad in Tangzhang town，Xuzhou city，by using finite element method. The liquefaction districting of saturated silty soil layer is made according to the comparative analysis of pore pressure ratio of soil and dynamic shear stress on the largest shear surface with going back and forth. Combined with liquefaction differentiation results of standard penetration test，shear wave velocity test and Seed-Idriss simplification method，the comprehensive evaluation is made on the behaviour of earthquake-induced liquefaction of silty soil layer of the railroad roadbed.
