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In recent years, GIS(Geographic Information System) develops rapidly, and it is applied in various industries. But the application of GIS in electronic commerce is far behind its application in other areas. Using the programmable interfaces provided by Google Maps, we created an online shopping system which has the map functions to probe the application of GIS in electronic commerce. The system adopts the B / S three-tier architecture model and uses the Google Maps API to embed the Google Maps into the system website. It uses Oracle database to save the system data, and the spatial data is used the data of Google maps. The data of the system Oracle database and the spatial data of Google maps are connected through the latitude and longitude. These can improve the system's extensibility greatly and reduce the developing difficulty and cost remarkably.