Chinese characters' engraving is often encountered in the mechanical processing. However, the module of Chinese characters engraving is often embedded in some of the CAD/CAM softwares which can only deal with planar Chinese characters' engraving. Moreover, the distortion problem of Chinese characters machined on curved surfaces has received more and more attentions. It is studied that the theory and strategy of NC machining tool-path planning for vector Chinese characters will be helpful to the de...