With the cooperative problem about computer aide design at present,we expound a thought through a instance in the secondary development of AutoCAD. Its main idea is to implement synchronization and asynchronism in cooperative design.

• 针对当前计算机辅助设计的协同的问题；通过实例阐述了对AutoCAD进行二次开发、实现同步、异步协同设计的思路.