Currently,　the　cardiovascular　diseases　threaten　almost　two　in　one　thousand　new　borns　all　around　the　world.　The　treatment　of　these　diseases　mainly　depends　on　the　surgeons＇　experiences.　Surgeons　have　to　choose　one　of　the　assumed　options　for　a　patient　without　comparing　which　is　more　feasible.　In　this　paper,　a　cardiovascular　surgical　planning　system　was　proposed　to　help　the　surgeons　predict　the　optimal　surgical　options　using　Computational　Fluid　Dynamics　(CFD)　and　numerical　analysis.　Three　significant　stages　were　included.　First,　patient-specific　three-dimensional　anatomical　model　was　reconstructed　from　CT　or　MRI　data.　Second,　the　reconstructed　model　was　modified　into　diverse　surgical　options　as　the　surgeons　envisioned.　Third,　the　modified　models　were　imported　into　ANSYS　or　CFX　for　CFD　simulations.　Hemodynamic　characters,　for　instance,　static　pressure,　flow　rate,　wall　sheer　stress,　total　pressure,　flow　structure　and　so　on　can　be　obtained.　Surgeons　are　able　to　predict　the　post-operation　outcomes　according　to　the　results　of　the　numerical　analysis.　This　paper　studied　the　Fontan　procedure　using　in　the　treatment　of　single　ventricle　congenital　heart　defect.