Google Maps API which developed by Google was released in the network map on a free API function set. This article describes its features, functions, development method of WebGIS based on the Google Maps API, and we develop the logistics network system based on it. Studies have shown that: With the help of the Google Maps API it can be easily embedded the map into the logistics web pages; it has high resolution data and user-friendly interface. With the help of Google Maps API and WebGIS, it can make the logistics rationing system to be visualization applications, and that is the future trending of logistics network system.