Milling is one of the main methods for pro-cessing titanium alloy.At present,the complex process of milling is usually simulated by finite element method,which often has problems in mesh distortion and mesh reconstruction.Therefore,a meshless three-dimensional milling simulation model was established for TC4 titanium alloy using the smooth particle hydrodynamics(SPH)method.Firstly,the established SPH model was analyzed by the LS-DYNA software,and the stress distribution,temperature field,and cutting force during milling were studied under specific conditions.Subsequently,the cutting force was simulated under different cutting parameters and the effects of these parameters on the cutting force were determined.Finally,based on a series of cutting force experiments,the accuracy of the simulation model was verified.This study proves the feasibility of SPH method in the simulation of titanium alloy milling process and pro-vides novel methods for investigating the processing mechanism and optimizing the processing technology of titanium alloys.