Renal　sympathetic　denervation　(RSD)　by　the　radiofrequency　ablation　was　used　to　treat　the　resistant　hypertension　in　clinic　and　has　achieved　curative　effect.　But　the　temperature　distribution　in　the　artery　walls　and　the　blood　flow　have　not　been　investigated.　Finite　element　method　(FEM)　based　on　Comsol　Multiphysics　4.3a　software　was　used　to　simulate　the　temperature　distribution　in　the　renal　artery.　The　results　of　renal　artery　temperature　distribution　as　well　as　blood　flow　effect　on　the　temperature　field　were　obtained,　which　demonstrated　that　the　blood　velocity　is　very　crucial　in　the　temperature　distribution　of　blood　vessel　near　antenna.　When　the　speed　of　blood　is　0.4　m/s,　the　highest　temperature　rise　of　arterial　wall　near　the　antenna　is　8.882　degrees　C　(37　degrees　C　to　45.882　degrees　C)　and　contralateral　artery　wall＇s　highest　temperature　rise　is　about　5　degrees　C　(37　degrees　C　to　42　degrees　C).　This　temperature　value　can　damage　renal　sympathetic　nerves　to　cure　the　resistant　hypertension.　Due　to　the　blood　flow,　the　temperature　field　stretches　to　the　direction　of　blood　flow.　The　temperature　rise　of　blood　is　only　in　a　small　range　(37　degrees　C　to　41　degrees　C)　at　both　ends　of　the　antenna.　The　simulation　of　RSD　by　the　radiofrequency　ablation　can　give　doctors　a　better　scheme　to　avoid　the　vascular　injury　in　different　blood　flow　rates　and　radiofrequency　voltages.