A　survey　of　public　transit　travelers＇　willingness　to　pay　was　carried　out　in　Beijing　through　Contingent　Valuation　Method　and　trip　characteristics　of　public　transit　travelers　were　discussed　and　transfer　price　threshold　was　concluded　under　different　time　ratio　between　rail　transit　and　bus.　Based　on　Ordered　choices　models,　transfer　price　threshold　model　within　public　transit　were　given　respectively　based　on　the　Ordered　Probit　and　the　Ordered　Logit　Model.　Finally　partial　effects　of　variables　were　analyzed　.　The　results　showed　that　gender,　occupation,　income,　bus　travel　costs,　and　travel　time　ratio　between　rail　transit　and　bus　had　a　significant　effect　on　the　price　threshold　of　the　mode　transfer　choice,　and　the　proportion　of　the　price　threshold　of　mode　transfer　which　is　3,　4,　5,　6　Yuan,　will　change　-5.03%,　1.07%,　2.32%,　1.00%　respectively　when　the　ticket　expenditure　of　bus　increases　one　Yuan　more.