Drunk　driving　is　one　of　the　main　causes　of　fatal　traffic　accidents　and　its　effect　on　driving　behavior　is　one　of　the　most　heated　research　debates.　The　driving　environment　such　as　emergency　parking　belts,　sharp　curves　and　obstacle　zones　on　a　freeway　were　simulated　by　a　driving　simulator.　The　driving　behavior　was　monitored　during　the　experiment.　The　drivers＇　performances　were　compared　in　their　different　drinking　states　under　the　same　conditions.　The　data　of　alcohol-impaired　driving　and　safe　driving　behaviors　show　that　the　alcohol-influenced　driving　performance　(steering　wheel,　accelerator,　brake　and　the　clutch　in　the　same　scene)　is　obviously　different　from　non-drinking　performance.　The　study　concludes　that　drinking　significantly　affects　driving　performance　and　this　data　has　practical　value　for　researchers　studying　drunk　driving　behavior　patterns.　©　2010　ASCE.