Radiofrequency　ablation　technique　is　one　of　the　tumor　hyperthermia　methods　and　has　been　widely　used　in　clinical　treatment　because　of　its　small　traumatic,　better　curative　effect　and　others　advantages.　Recently,　the　common　automatic　control　of　radiofrequency　ablation　system　is　temperature　control　model　that　only　used　to　control　electrode　tip　temperature　by　controlling　center　of　the　output　power　to　prevent　cooking,　rather　than　monitoring　temperature　of　tumor　edge,　leading　to　the　result　is　not　accurate.　So　for　the　purpose　of　being　ablated　completely　without　damaging　the　normal　tissue,　this　paper　puts　forward　with　double　temperature　controlling　system　to　monitor　the　electrode　tip　and　the　tumor　edge　temperature　at　the　same　time,　and　control　the　output　power　according　to　the　change　of　the　temperature,　in　order　to　achieve　the　purpose　of　accurate　ablation.　Now　The　design　of　radiofrequency　ablation　signal　have　been　finished,　including　the　final　output　signal　peak-to-peak　voltage　of　140V,　current　0.3A,　total　power　adjusted　in　2W　to　18W.