Abstract: Urban traffic information management is an important way of solving traffic jam of city. With the wider use of 3G networks, urban information management based on 3G will be a central issue of application. The paper designs a plan of GPS vehicle navigating and guiding system using 3G mobile network and GIS electronic map according to travel behavior of people. It discusses moving object’s time-space attributes which be described by a fivefield and a directed graph. It analyzes the GPS mobile apparatus’s function modules and structure. It improves the function of GPS mobile apparatus which can provide guiding function using the shared information of traffic. The navigation based on the shortest path algorithm is improved to one based on the real-time traffic flow of moving objects. The GPS mobile apparatus can provide the navigating and guiding decision-making for people.

Key words: moving objects, urban informatization, global positioning system, geographic information system, 3G