The　restenosis　after　coronary　artery　bypass　graft　(CABG)　is　attributed　to　the　formation　of　intimal　hyperplasia　(IH)　at　the　anastomosis,　which　is　closely　related　to　hemodynamic　depend　on　the　geometric　model.　In　order　to　give　a　reasonable　assessment　of　the　surgery　effect　and　judge　the　longterm　patency　rate,　the　hemodynamic　of　CABG　surgery　program　is　compared　with　that　of　surgery　design　of　the　junction　angle　changed.　Based　on　in-vivo　CT　coronary　angiography　datasets,　the　individual　geometric　model　of　CABG　reconstructed　instead　of　idealized　geometric　models　are　applied　to　simulate　the　real　physiological　blood　flow　utilizing　pulsatile　flow　boundary　waveforms　in　the　present　study.　The　simulation　results　show　the　maximum　wall　shear　rate　(WSS)　value　is　at　the　bottom　of　anastomosis.　Moreover　the　stagnation　zone　growing　gradually　with　the　greater　angle　downstream　the　anastomosis　is　prone　to　form　the　IH,　which　is　consistent　with　clinical　observation.　It　is　proved　that　the　surgery　being　better　suited　to　maintain　graft　patency　is　successful.　©　2013　Springer-Verlag.