Hemodynamics　are　thought　to　play　an　important　role　in　the　creation,　thrombosis,　recanalization,　regrowth　and　re-bleeding　of　cerebral　aneurysms　treated　by　endovascular　means.　And　the　3D　reconstruction　of　cerebral　aneurysms　and　vessels　is　the　fundamental　approach.　According　to　CT　scanning　data　from　PLA　general　hospital,　clinical　3D　cerebral　aneurysm　is　reconstructed　integrating　MIMICS　8.1　digital　medical　image　management　software.　At　last,　the　result　document　was　transferred　to　ANSYS　software.　Cerebral　aneurysm　FEM,　which　can　be　applied　to　simulation　of　hemodynamics　in　cerebral　aneurysm,　is　presented.　This　model　is　not　only　digital　but　also　individual,　and　can　be　used　to　calculate　mechanical　property　in　cerebral　aneurysm,　which　is　contributed　to　its　prevention　in　rupture　and　endovascular　treatment　theoretically.