According to the milling chatter stability limit theory,the titanium alloy thin-walled part was taken as the research object,the engineering field acquisition method for two-dimensional chatter stability limit region was described in detail.For the chatter stability limit distortion,caused by repeated clamping,modal coupling appeared in the process of material removal and batch processing,on the basis of comprehensive consideration of workpiece processing quality,efficiency,environmental impact and other factors,a guidance algorithm for the optimal selection of process parameters in the two-dimensional flutter stability limit region was proposed and designed,based on the fuzzy analytic hierarchy process (FAHP).The optimized process parameters were verified in engineering.