In　order　to　investigate　the　validity　of　bypassing　treatment　for　aortic　dissection,　two-dimensional　idealized　geometry　models　of　DeBakey　III　aortic　dissection　and　its　bypassing　treatment　were　constructed.　Computational　simulations　of　physiological　blood　flow　in　these　models　were　performed　with　the　software　of　ANSYS　using　finite　element　method.　After　bypassing　treatment,　the　blood　flow　velocity　and　the　pressure　in　the　false　lumen　of　aortic　dissection　are　both　less　than　those　before　the　operation.　Bypassing　can　effectively　reduce　the　pressure　of　aortic　arch　and　ease　the　impulsion　and　stress　of　blood　flow　on　the　pathological　dissection.　Bypassing　is　an　prospective　surgical　approach　for　the　treatment　of　DeBakey　III　aortic　dissection.