Purpose:　Sequential　graft　and　Y-type　graft　are　two　different　surgical　procedures　in　coronary　artery　bypass　grafting　(CABG).　The　hemodynamic　environment　of　them　are　different,　that　may　cause　different　short-term　surgical　result　and　long-term　patency.　In　this　study,　the　short-term　and　long-term　result　of　sequential　and　Y-type　graft　was　discussed　by　comparing　the　hemodynamics　of　them.　Materials　and　Methods:　Two　postoperative　3-dimensional　(3D)　models　were　built　by　applying　different　graft　on　a　patient-specific　3D　model　with　serious　stenosis.　Then　zero-dimensional　(0D)/3D　coupled　simulation　was　carried　out　by　coupling　the　postoperative　3D　models　with　a　0D　lumped　parameter　model　of　the　cardiovascular　system.　Results:　The　flow　rate　of　native　coronary　arteries　and　grafts　are　all　calculated　and　illustrated　in　this　paper.　No　significant　difference　of　the　native　coronary　arteries　flow　and　graft　flow　exists　between　two　surgical　procedures.　The　wall　shear　stress　(WSS)　and　streamline　were　also　depicted.　The　graft　WSS　of　sequential　graft　is　19.1%　higher　than　Y-type　graft.　While　flow　separation　appears　at　the　bifurcation　of　Y-type　graft.　Conclusion:　The　short-term　outcomes　of　sequential　graft　and　Y-type　graft　are　almost　the　same.　But　it　can　be　found　from　the　hemodynamics　factors　that　the　longterm　patency　of　the　sequential　graft　is　better.　Copyright　©　2015　Tech　Science　Press.