Urban　traffic　congestion　problem　is　increasingly　serious.　In　view　of　the　bus　service　delay　problems　in　peak　hour,　this　paper　proposes　a　method　to　match　arrival　time　and　calculates　the　delay　time　in　bus　service　by　using　the　difference　of　travel　time　in　peak　hour　and　in　non-peak　hour　based　on　IC　card　data,　then　identifies　delay　areas.　Based　on　IC　card　data　in　Beijing,　the　delay　time　of　more　than　800　bus　routes　in　Beijing　is　calculated　and　analyzed.　The　results　show　that　the　arrival　corridor　and　the　transportation　junction　are　the　areas　with　large　delay　time　and　frequent　delay.　The　delay　time　in　bus　service　is　positively　correlated　with　the　number　of　passengers　and　the　distance　between　stations,　but　has　no　obvious　correlation　with　the　distance　from　the　city　center　and　the　density　of　road　network.　The　delay　time　per　kilometer　is　negatively　correlated　with　the　distance　between　stations.　©　ASCE.