Fiveaxis CNC machine tool postprocessing is the key step to optimize the processing process.The difficulty is how to improve the continuity of the shaft movement as far as possible under the conditions of meeting the knife axis vector.A theoretical solution for solving the position vector of each row was proposed by using the motion stroke limit.Then,according to the effective solution type,two different alternative solutions were obtained.The optimal solution was selected for which no corner change or mutation is less.This method can overcome the limitation of the advantage interval and the machine tool mechanism,and has generality.It can effectively utilize the machine tool travel and avoid the additional tool path due to the discontinuity of the turning angle to improve the processing efficiency and stability.