Mechanical products more and more tend to be more complex.High precision requirements are put for the design and production.Traditional design methods and models are difficult to meet the needs of new products,which restrict the process of information development of machinery enterprises.Based on the private cloud experimental platform,modern aided design software was applied to the cloud manufacturing.Combining with modern design and manufacturing methods,the product modular design and auxiliary design flow chart was proposed.The stability and operability of the cloud manufacturing platform was verified through specific application case.