It　is　difficult　to　find　the　rules　of　passenger　flow　in　the　urban　rail　transit　(URT)　due　to　the　difficulty　in　the　travel　choice　collection.　In　order　to　study　the　route　choice　rule,　a　passenger　intention　survey　has　been　conducted　in　Beijing　urban　rail　transit　(BURT),　which　includes　the　socio-economic　attributes,　perception　of　transfer　and　congestion,　and　choice　intention　of　passengers.　BURT　passengers　are　divided　into　eight　groups　based　on　the　socio-economic　attributes.　Of　these　groups,　the　route　choice　trend　of　the　young　and　middle-aged　passengers　with　low　and　medium　income　is　similar,　and　these　passengers　account　for　75　percent,　which　is　the　major　passenger　group.　Then　the　main　factors　influencing　route　choice　are　extracted,　and　quantified　by　uniform　cost　standard.　And　route　choice　model　of　the　major　passenger　group　is　constructed　based　on　Logit　model.　Finally　the　BURT　network　is　used　to　verify　the　validity　of　this　model.