The　traffic　congestion　can　cause　operational　capacity　drop　phenomenon　on　freeway　bottleneck　segment.　To　reveal　the　capacity　diversification　regular　pattern,　the　asymmetric　driver　behavior　theory　is　used　to　improve　the　Newell　car-following　model.　The　improved　car-following　model　is　calibrated　and　implemented　in　field　data　simulation.　By　12　simulation　scenarios　and　field　data　analysis,　the　results　show　that　the　improved　Newell　car-following　model　can　increase　accuracy　in　estimate　the　bottleneck　operational　capacity　compared　to　the　model　that　Highway　Capacity　Manual　(HCM2010)　provided.　The　traffic　congestion　due　to　the　lane　drop　is　analyzed,　the　operational　capacity　varied　in　condition　close　different　lane　and　number　of　lanes,　then　the　varied　value　is　figured　out.　The　operational　capacity　on　major　lane　bottleneck　segment　decreases　by　changed　the　flow　on　on-ramp　and　off-ramp　in　range　of　certain　flow　change,　and　the　most　decreased　value　is　calculated.　In　conclusion,　the　results　can　provide　reference　for　migrate　congestion　on　freeway　bottleneck　segment.　©　2015,　Science　Press.　All　right　reserved.