There are many linear phenomena in our daily life. They are traffic, communication, and goods transportation etc.These phenomena can be organized into linear networks in ARC/INFO Geographic Information System (GIS). This paper describes how to Prepare, and create the City of Beijing traffic network by using ARC/INFO GIS.PATHFINDING and ALLOCATE are two functions in ARC/INFO NETWORK. The best path can be found between an origin and a destination, and the most efficient movement of resources can be allocated by using the two functions.After the network coverage (a file of traffic map in ARC/INFO GIS) processed, the network database has been created.The different applications of the network can be done.Finally, the modelling of traffic network has been established.It is not only for extending streets, also for building a new traffic route very efficientlly.