By adopting the principle of separation of front and back ends, this paper studies the underlying technology of joint development of multiple platforms, and proposes an architecture design for the development of refined management platforms. Using Vue+Elementui+Webpack technology to build the front-end of the platform; using SpringCloud+MariaDB+Logback technology to build the back-end of the platform; after the front-end and back-end are built in the separated mode, the front-end and back-end data connection research is carried out through the API interface provided by the back-end.Using Flutter, SQLite database, Android and IOS systems to carry out the construction and design of the platform mobile terminal; through database selection, construction, security, and interface settings, which provides technical support for the management of platform data. Through the research on front-end, back-end, mobile phone and database management, the article designs a set of refined management platform which is conducive to the integration, transmission and sharing of engineering information, and convenient for all parties to view, modify, store, and trasfer engineering information anytime and anywhere. The platform also provides a reference and technical support for improving the efficiency and precision of engineering project management.