Bus　transfer　time　threshold　can　distinguish　transfer　behavior　and　secondary　travel　behavior　accurately.　It　has　great　significance　for　improving　the　accuracy　of　the　transfer　time　by　using　IC　card　data　and　also　affects　the　urban　transport　planning　and　service　level　of　bus.　By　site　survey,　the　bus　transfer　modes　are　classified,　and　then　the　impact　factors　on　bus　transfer　modes　transfer　time　are　analyzed.　A　model　for　bus　transfer　time　with　various　influencing　factors　is　established　from　the　microscopic　point　of　view　which　can　validate　the　accuracy　and　reliability　by　survey　data.　Finally,　various　types　of　transfer　time　thresholds　can　be　obtained　using　the　way　of　GIS　transit　network　elements.