工程图的变参设计是快速实现产品变型及系列化的有效方法．文中提出了把涡旋压缩机零部件分解成直线、圆弧、渐开线３种几何模型，建立了统一数据结构的参数化几何模型，便于变参图形设计模块与系统的数据共享．利用图素组合方式生成图形速度快，精确度高，产品的开发设计周期明显缩短 The variable parameter design of the drawing is an effective way to quickly realize product variations and serialization. In this paper, three kinds of geometrical models of the scroll compressor are decomposed into linear, arc and involute. The parametric geometric model of uniform data structure is established to facilitate the data sharing between variable graphic design module and system. The use of pixel combination of graphics generation speed, high accuracy, product development and design cycle was significantly shortened