Abstract: To achieve the minimize deformation in the processing of thin-wall parts, the paper studied on the cutting parameter optimization by the deformation simulation using UG NX. A finite element simulation model was established to analyze the deformation of thin-wall liner at some instant. An experiment was designed to contrast simulation results, which showed that the simulation data were highly consistent with the actual measurement data. Finally, an orthogonal experiment based on finite element simulation was intended to optimize the cutting parameters.