This system is an intranet office system based on Intranet's Web technology and completely adopts B/S architecture. The unique information flow design of this system greatly improves the efficiency of information transmission within and between government/enterprise departments, and minimizes the cost in the information transmission process. Office workers can be freed from complex daily office affairs and participate in more thoughtful and creative work. The COS system strives to highlight the characteristics of a concise architecture, practical functions, and simple and easy management and maintenance. At the same time, in order to adapt to the needs of continuous development and change, the architecture of the service catalog has good scalability.