Based　on　the　of　historical　data　past　nine　years,　a　Double　Exponential　Smoothing　(DES)　method　is　used　to　estimate　the　recent　public　transport　services　demand　(PTSD)　in　Beijing　and　medium-term　change　trends,　its　demand　and　its　relevant　characteristics.　What　we　find　as　follow:　1.　In　the　next　five　years,　the　total　demand　for　dominant　transit　services　average　about　5　billion　passengers,　with　an　annual　average　of　the　interval　of　dynamic　adaptive　service　demand　increase　would　inhabit　about　60　to　140　million　people.　2.　The　PTSD　showed　stickiness　obviously　which　had　been　highly　insensitive　to　the　factors　of　economic　growth,　the　changed　total　resident　population　and　tourism　growth.　3.　Simply　transit　price　decline　can　hardly　change　the　behavior　of　latent　consumer.　Therefore,　we　need　a　further　study　of　transfer　channels　for　financial　subsidies.　On　the　other　hand,　we　should　combine　the　re-allocation　of　rights　of　road　in　order　to　improve　the　consumption　environment　of　public　transport,　thereby　effectively　stimulate　the　PTSD　increase.