【摘要】 介绍了三种常用的CAD／CAM系统中CAD模型数据交换标准格式和发展状况，分析了各种格式的特点和系统之间数据转换中常出现的缺陷及解决缺陷的方法。指出在CAD模型数据转换过程中，为转换数据的准确和所获得CAD模型的精确，应遵循一定的建模原则。更多还原

【Abstract】 Three types of common data transformation standard forms and development situation of CAD model in the CAD/CAM system are presented. Features of each form, defects frequently occurred in the data transformation Of the system and remedy methods are analyzed. Then model establishment principle tO be complied with is set fO~rd during the CAD model data transformation in order to get accurate data transformed and precision CAD model.更多还原