Considering　the　blood　coagulation　induced　by　the　heating　of　radio　frequency　ablation　(RFA)　and　the　mechanism　of　aneurysm　embolization,　we　proposed　that　RFA　may　be　used　to　treat　arterial　aneurysm.　But　the　safety　of　this　method　should　be　investigated.　A　finite　element　method　(FEM)　was　used　to　simulate　temperature　and　pressure　distribution　in　aneurysm　with　different　electrode　position,　electric　field　intensity　and　ablation　time.　When　the　electrode　is　in　the　middle　of　the　artery　aneurysm　sac,　temperature　rose　clearly　in　half　side　of　artery　aneurysm,　which　is　not　suitable　for　RFA.　Temperature　rose　in　the　whole　aneurysm　when　the　electrode　is　under　the　artery　aneurysm　orifice,　which　is　suitable　for　the　ablation　therapy.　And　in　this　way,　the　highest　temperature　was　69.585　degrees　C　when　power　was　5.0　V/mm　with　60　s.　It　can　promote　the　coagulation　and　thrombosis　generation　in　the　aneurysm　sac　while　the　outside　tissue　temperature　rises　a　little.　Meanwhile,　the　pressure　(10　Pa)　at　the　top　of　aneurysm　sac　with　electrode　insertion　is　less　than　that　(60　Pa)　without　electrode,　so　electrode　implant　may　protect　the　aneurysm　from　rupture.　The　results　can　provide　a　theoretical　basis　for　interventional　treatment　of　aneurysm　with　RFA.