Ｅｘｃｅｌ作为一种电子表格软件，在商业领域发挥了巨大的作用。本文把它引入到机械设计中，充分发挥其数据管理的优越性，对设计手册电子化，并且巧妙地与绘图软件ＡｕｔｏＣＡＤ结合，实现参数化作图。以此为基础，开发出了一套链传动ＣＡＤ系统。 Excel as a spreadsheet software has played a huge role in the business world. This paper introduces it into the mechanical design, give full play to its superiority of data management, electronically design the manual, and cleverly combined with the drawing software AutoCAD, parametric mapping. Based on this, a chain drive CAD system has been developed.