Beginning with the classification and design method of packing CAD drawing,the comparison of AutoCAD's secondary development was done.A way was given to realize auto-design of package structure with VBA component of AutoCAD base on the idea of function unit and parameterized design.A course was illustrated through the auto-design of paper box.It is easy to realize and the development is inexpensive,it fit to development individual system of package design with VBA component of AutoCAD.