The relation between cutting force and cutting parameters was discussed based on physical analysis of machining,and the mechanical model of irregular curve process was built.The milling experiment was designed by using single factor experiment method and the model parameters were confirmed by using least square method.An irregular curve force measuring experiment was done.The results show that using this method,the force can be kept almost invariant,the processing quality is improved and the working time is shortened.It preponderates in raising efficiency and precision