According to the performance and functional requirements of blockchain applications, the design concept of integrated baas platform is studied, and the overall architecture of baas supporting the construction of fast alliance business chain is proposed. The design and implementation methods of baas platform are studied from the aspects of high availability computing technology, ap- plication standards and access specifications. Finally, the feasibility of the proposed scheme is verified through three scenarios of us- er login, data link up and data query in 50 blockchains.