The　heart　tissue　is　rich　in　blood,　which　flow　is　a　thermal　diffusion　process;　it　can　lead　to　lesion　shape　differences.　The　temperature　distribution　is　very　hard　to　obtain　through　the　antenna　specific　absorption　rate,　thus　affect　curative　effect.　Based　on　the　Pennes　bioheat　transfer　equation,　high　flow　rate　of　blood　effect　on　microwave　ablation　in　atrial　fibrillation　was　analyzed.　Lesion　depths　and　diameters　were　analyzed.　©　2011　IEEE.