Abstract: In the traditional jacquard CAD system,image can be processed only on one layer.In order to enhance the system ability of processing images and increase the efficiency of designing,this paper applies layer technique in jacquard CAD system,and vector map editing and mathematical morphology method fit for the jacquard CAD field are used at the same time.A jacquard CAD image processing system based on the layer technique is finally designed.The system is programmed in Delphi 7.System architecture,implementation principle of each module and core algorithm are introduced.Through the above methods,good effect is gained at last,which demonstrates that this technique has broad prospects for application.