Simulation　software　is　a　important　tool　in　transportation　research　This　research　effort　focused　on　simulating　pedestrian　behaviors　during　2008　Beijing　Olympics　Games　by　LEGION　simulation　software　The　case　study　is　carried　out　by　comparison　the　real　pedestrian　density　between　without　traffic　organization　and　with　traffic　organization　which　was　the　result　of　simulation　by　LEGION　software　It　is　concluded　that　the　duration　of　peak　hour　was　reduced,　level　of　service　raise　in　the　exits　area　and　sonic　potential　safety　problems　were　prevented　These　results　verified　the　effect　of　improvement　measures　through　pedestrian　simulation.