To　investigate　the　influence　of　bypassing　treatment　on　the　hemodynamic　parameters　of　aortic　dissection　and　the　feasibility　of　this　therapeutic　approach　in　clinical　application,　idealized　three-dimensional　geometric　models　of　DeBakey　III　aortic　dissection　with　a　blind　lumen　and　its　bypassing　treatment　were　constructed　with　the　software　of　SolidWorks　2007.　Then,　numerical　simulation　was　performed　utilizing　the　software　of　ANSYS　11.0,　and　the　results　were　analyzed.　The　velocity　of　blood　flow　and　the　pressure　at　the　entrance　area　of　false　lumen　and　in　the　false　lumen　are　both　less　than　those　before　the　operation.　Bypassing　is　an　effective　surgery　for　the　treatment　of　DeBakey　III　dissection.　It　can　effectively　reduce　the　pressure　of　aortic　arch　and　ease　the　impulsion　and　stress　of　blood　flow　on　the　pathological　dissection.　It　can　also　alleviate　the　propagation,　prevent　the　rupture,　and　promote　the　healing　of　dissection.　©2010　IEEE.