With　the　increasing　cars　and　number　of　residents　in　Beijing,　the　shortage　of　urban　road　capacity　has　become　increasingly　conspicuous.　In　this　paper,　public　transportation　network　evaluation　factors　such　as　the　length　of　bus　lines,　line　density,　repeated　factor,　non-linear　coefficient,　site　density,　the　average　station　distance　and　Geographic　Information　Systems　(GIS)　technology　will　be　used　to　evaluate　the　public　transportation　network　in　Beijing　inside　of　the　5th　ring　road　to　make　appropriate　improvements.　In　addition,　the　article　conducts　evaluation　of　the　network　to　reveal　the　existing　problems　to　find　a　reasonable　solution　and　further　develop　the　line　optimization　program.　Finally,　the　results　are　used　to　improve　public　transportation　ground　to　lay　the　foundation　of　operational　efficiency.　©　2010　ASCE.