The Meteorological Observation Center of the China Meteorological Administration (CMA) has carried out a vertical comprehensive meteorological observation experiment of megacities. In order to collect and manage a large amount of long-term observation data with new ground-based remote sensing equipment, a megacities observation data system platform has been designed and built. Based on Web technology and the MySQL database, the system has the functions of real-time data transmission, monitoring, storage, analysis, display and sharing. It standardizes the management of new remote sensing observation data and makes product diversification convenient to share. The system improves the data support ability of the new remote sensing equipment and the minute profile data products meet the high timeliness requirements of the short-term weather forecast and nowcasting for real-time data. At present, the system has been popularized and applied in some cities to provide comprehensive platform support for the operational operation of ground-based remote sensing equipment.