To solve the problem of lower degree of information sharing, the slower responsing market ability and the more duplicate work in the process for crane design. The shortcomings of the existing network collaborative design were analyzed, a new network design model--cloud design had been raised. The information sharing mechanism, cloud computing, cloud infrastructure was researched thoroughly. Based on it, the crane cloud design platform was constructed. Because of the characteristic that the crane has a higher structure type degree, parametric variant design and cloud design were combined organically, developed Crane parameter collaborative design system based on Cloud Infrastructure, and took a girder design of casting crane car frame as an example to verify it.