Abstract: An environmental data sharing platform based on service oriented architecture was designed and implemented to share heterogeneous environmental data scattered in various systems and locations characterized by heterogeneous and lack of spatial data sharing. Some key technologies such as service oriented architecture(SOA), Web Service, Service GIS, and middleware technology were integrated and applied in this platform to realize functions such as metadata service, attribute data and spatial data mutually retrieving service, spatial data aggregation service, web data mining service, and multi-service register service. The platform can share different environmental data such as environmental thematic data, fundamental geographic data, remote sensing images, hydrological and meteorological data, and spatial data services based on environmental databases and metabase. In addition, the platform based on service oriented architecture bears openness and expansibility so that various environmental data resources and spatial data services from networks can be integrated into the platform.