First of all, it must meet various requirements such as machining range, working accuracy, productivity and economy; second, it must ensure the relative position and relative movement of workpiece and cutter required by the established process method. Under the economic and reasonable conditions, try to use a shorter transmission chain to simplify the mechanism and improve the transmission accuracy and efficiency; then make sure that the engraving machine has the rigidity, vibration resistance, thermal deformation and noise level suitable for the required processing accuracy; then it should be easy to observe the processing process, easy to operate, adjust and maintain, easy to transport, load and unload workpieces and clean up, note Finally, ensure the structure is simple, reasonable and reliable, easy to process and assemble.