This　article　investigated　the　stated-preferences　of　parkers　to　choose　the　trip　modes　under　different　policies　in　downtown　Beijing,　and　discussed　the　sensitivity　of　parkers　to　parking　fees,　finally　put　formard　a　method　about　how　to　make　parking　fee　standards　in　megapolis　downfown　from　the　perspective　of　parkers　intent　of　payment　for　parking,　in　order　to　improve　the　transportation　Demand　Management.