In　order　to　investigate　the　mechanisms　of　aortic　dissection,　the　mechanics　of　the　initiation,　propagation　and　treatment　of　aortic　dissection　were　analyzed　and　reviewed.　The　mechanism　of　aortic　dissection　induced　by　the　motion　and　deformation　of　aortic　arch　was　analyzed.　A　novel　viewpoint　with　the　mechanism　of　stress　concentration　and　fatigue　failure　contributed　to　the　propagation　of　aortic　dissection　was　proposed.　The　hemodynamics　simulation　of　bypass　grafting　treatment　for　De　Bakey　III　aortic　dissection　was　introduced.