Abstract: This paper analyzes the features of visualization of spatial data in Web environment, proposes an object oriented of node-based spatial data model, which expresses and manages spatial data by means of object-oriented approach, and designs the efficient architecture of visualization of spatial data.The architecture makes a breakthrough in organization, management, transmission and display of large spatial data, implements visualization of spatial data in Web environment.At last, a application is given, it includes functions such as visualization of spatial data, flying via and information inquiring.