Urban　public　transit　financial　subsidy　is　one　of　the　key　links,　which　promote　public　transit　priority　strategies.　It　is　an　important　issue　of　urban　traffic　sustainable　development　to　establish　a　specific　operable　subsidy　calculating　model　and　to　improve　the　way　to　calculate　urban　public　transit　subsidy.　This　study　establishes　the　game　model　among　the　income　of　residents,　enterprises　operating　costs,　and　subsidies　through　utility　theory.　It　shows　the　advantages　of　classification　subsidy　of　public　transit　riders　and　establishes　a　specific　operable　subsidy　calculating　model.　Then,　the　calculation　of　Beijing　public　transit　subsidies　in　2007　is　taken　as　an　example.　The　results　indicate　that　the　subsidy　classification　and　the　subsidy　calculating　model　not　only　can　fully　satisfy　the　travel　demands　of　public　transit　riders　but　also　can　effectively　calculate　the　subsidy　amount,　which　realizes　the　utility　maximization　of　government　subsidy.　The　proposed　method　is　proved　to　be　a　new　effective　way　to　measure　urban　public　transit　subsidy.　©　2009　China　Association　for　Science　and　Technology.