The paper analyzes constitutions of development library of common CAD software ,and CADTool development library CLS is researched and realized. CDL and its application are expounded. Users can conveniently develop a special CAD system.

• 分析了通用CAD软件平台的开发库的必要组成 ,研究开发了凯图软件 (CADTool)开发库CDL(CADToolDevelopmentLibrary) ,并对凯图图形开发库CDL进行了阐述 ,使用户可以方便地开发专用CAD系统