This paper analyzes the cutter cutting soil process based on the finite element method(FEM).Cutter parameterized model is set up,and modal analysis is carried on.The amplitude is obtained under different order natural frequency,which provides the reference for cutter manufacturing.LS-DYNA is used to simulate the process of the cutter cutting soil,and MAT147 model is selected for soil materials.Different time cutting form of the soil is researched,and the simulated cutting resistance is compared with theoretical results,which verifies the reliability of numerical simulation.