A new algorithm of lossless compression about free-form curve and surface in CAD models was proposed to effectively exchange and transmit the model data in collaborative design environment.

• 针对协同设计环境下三维CAD模型网络传输慢等技术瓶颈，提出了一种针对精确CAD模型中自由曲线曲面的无损编码压缩算法。