Automatic programming increasingly plays an important role in intelligent numerically controlled (NC) coding and Computer-Aided Manufacturing (CAM), which greatly improves the efficiency and reliability of NC system, and relieves the work loads of programming. A graphic automatic programming system for NC laser processing machine LCM-408 is developed by using ObjectARX in AutoCAD and Visual C++. Laser cutting path is presented with the employment of Polyline, in which vertex and bulge are searched out in turn by iterating all graphic entities. The height and width of the tight bounding box of cutting region are obtained by comparing the minimum point and maximum point of the AcDbExtent of each cutting entity. The cut-in or cut-out curve is automatically added to the beginning and ending of each cutting entity for improving the quality of the cutting edge. The cutting sequence can be modified by user choosing one after another or grouping the cutting entities. G-code is generated from the laser cutting path and verified with static simulation.