Objective:　To　investigate　the　influence　of　different　protrusion　distance　of　stent　strut　into　the　subclavian　artery　on　local　hemodynamics　of　the　vertebral　artery　(VA)　ostium.　Methods:　Five　models　of　the　VA　were　established.　Model　1　was　without　stent　implantation,　Model　2　to　5　was　with　stent　protruding　into　the　subclavian　artery　for　0,　1,　2,　3　mm,　respectively.　Computational　fluid　dynamics　analysis　was　performed　to　study　the　differences　of　hemodynamics　in　these　models.　Results:　After　stent　implantation,　the　wall　shear　stress　and　the　blood　flow　velocity　at　the　stent　segment　in　the　Model　2　was　reduced　by　85.33%　and　35.36%,　respectively.　The　phenomenon　of　swirling　flow　disappeared.　For　models　with　different　protrusion　distance,　the　maximum　difference　of　wall　shear　stress　of　VA　was　0.76%,　and　the　maximum　difference　of　blood　flow　velocity　is　0.45%.　Conclusions:　Stent　implantation　can　improve　the　hemodynamics　of　vertebral　artery　ostium　stenosis,　while　the　protrusion　distance　of　stent　strut　has　no　obvious　influence　on　the　blood　flow　velocity　and　wall　shear　stress.