Abstract: In the application of web based GIS, how to transfer efficiently the geospatial information, such as the users’ spatial query submits and the result data from GIS database, through the network is a key factor to determine the capability of the system. The problems in the GIS applications and the current trends of GIS are discussed in the paper. Then a web based GIS data transfers technique and its characteristics are presented. The technique has already been used in some projects and has achieved a satisfactory result.