Public administration has been affected by the development of Information and Communication Technologies (ICTs) substantially. To tackle with the increasingly complex and uncertain problems, how to fully utilize ICTs for processing and applying information has becoming a crucial issue for local governance. For the above mentioned purpose, Geographic Information System (GIS) has been widely used in solving public issues in many countries. Efforts devoted to the development of the National Information System (NIS) by our government are impressive, and substantial results and experiences have been accumulated. However, public administration community has yet to explore this area. This article will first briefly introduce GIS' potential functions in public administration and policy, and the probable obstacles in its applications. Then, a hypothetical case will be demonstrated for illustrating the actual operation procedures of GIS. Finally, some policy recommendations regarding how local government can promote and utilize GIS are provided for consideration.