The　purpose　of　building　a　driving　simulation　system　is　to　realize　traffic　and　road　simulation.　By　studying　these　key　factors　about　building　or　reappearing　the　road　scenario:　setting,　coloring　and　simplifying　the　3D　model,　road　surface　lying,　road　and　traffic　reappearing,　and　so　on,　then　building　the　road　and　traffic　in　man-machine　interface　systems　in　the　simulation　cockpit　are　realiaed,　according　to　actual　research　needs:　road　terrain　features,　geometrics,　road　surface　conditions,　and　traffic　demands　in　the　AutoSim　system.　Simulation　of　the　road,　traffic　and　environment　characteristics　are　realized　systematically.