Abstract: China Integrated Meteorological Information Sharing System (CIMISS) is the operational data management and service system, which is distributed in National Information Center and 31 Provincial Information Center with main function of data collection and dissemination, quality control and product generation, data management, data services and operational monitoring.CIMISS is the uni fied data environment to support the national and provincial meteorological services, and was put into operation at the end of 2016. In this paper, the operational positioning of CIMISS is analyzed, and the structure, layout, functions and data flow of CIMISS are introduced. The value of CIMISS to the informatization is expounded. The achievements and bene fits are concluded. The applications of CIMISS in weather, climate and data services are introduced. Finally, the future development and application of CIMISS are prospected.