Abstract: Based on the micro service architecture, Shenzhen University has constructed a new generation of library service platform. Aiming at the problem that the business system needs to be reengineered to access the new platform, this paper puts forward a general methodology of library business system re-engineering based on the microservice architecture, which includes the principles of system reconfiguration and the specific practical framework. Through the example of OPAC and its peripheral system reconstruction, the process and effect of reconstruction work with this framework are illustrated.