The difficulty of five-axis post-processing of UG lies in the machining mode of multi-axis collaborative machining. Five-axis post-processing is an efficient machining method for complex curved parts, which needs the help of multi-axis collaborative machining. Because the collaborative machining between multiple axes needs precise control, the difficulty of five-axis post-processing is how to ensure the accuracy and stability of multi-axis machining, and how to distribute the machining load reasonably among the axes.