Based on the researches on the real time sharing technology of meteorological data, which uses the concept of data market, a meteorological data sharing platform for Yangtze river area between Shanghai, Zhejiang, Jiangsu and Anhui provinces is first built. The platform is designed by the standard system and distributed data management model, which makes use of the multi layer system architecture. The sharing and organization of meteorological data show unification in both physical distribution and logical inference. The platform can effectively support weather nowcasting for real time data and mobile observation. It also can improve the efficiency of meteorological data sharing in real time and reduce the difficulty of data transfer.