In view of the problems existing in the early design of the bridge crane digital development system,such as the poor compatibility of the development environment,the small circulation area,the backward development language,and the limitation of the design idea,a cloud platform for bridge crane was developed.In the digital system,ASP.Net.Core in Visual Studio 2013 was used as the development framework,C# was taken as the development language,the three-dimensional model drive and the mechanism size layout check were completed;according to NSGA-II algorithm,the design feasibility of the main beam was verified and the lightweight design scheme was given,then the engineering drawings were quickly generated and adjusted.Finally,SaaS service mode of cloud development was used to realize the collaborative and customized design of multi-tenant on the web browser.The system is compatible with multi-development environment,and provides reference for the development of traditional crane industry from digitization to intelligence.