More　and　more　attention　has　been　paid　to　understanding　the　choice　of　commuter＇s　departure　time.　This　research,　by　adopting　revealed　preference　approach,　has　investigated　how　car　commuters　chose　the　departure　time　during　morning　peak　hours　on　weekdays　in　Beijing.　In　this　paper,　the　characteristics　and　influential　factors　on　the　choice　of　car　commuter＇s　departure　time　were　analyzed.　Car　commuter＇s　survival　time　of　different　travel　OD,　travel　time　and　acceptable　congestion　time　were　analyzed　by　using　Kaplan-Meier　method.　The　results　reveal　that　the　cumulative　frequency　curve　of　car　commuter＇s　departure　time　can　be　described　by　logistic　curve.　And　the　car　commuters　who　cross-district　travel　are　likely　to　arrange　an　earlier　travel　than　those　of　internal　district　travel.　In　addition,　as　the　travel　time　and　acceptable　congestion　time　of　car　commuters　increase,　car　commuters　choose　earlier　departure　time.　The　research　findings　can　provide　a　reference　for　relieving　urban　traffic　congestion.　©　2017　Hong　Kong　Society　for　Transportation　Studies　Limited.　All　rights　reserved.