Radiofrequency　ablation　(RFA)　has　been　widely　used　in　the　treatment　of　multiple　tumors.　Temperature　control　plays　a　crucial　role　in　radiofrequency　ablation.　In　order　to　select　the　optical　controller　and　realize　real-time　control　of　temperature,　this　paper　presents　a　Fuzzy　proportional　Integral　Derivative　(Fuzzy-PID)　control　method　is　applied　to　the　radiofrequency　ablation　temperature　control　system　and　made　the　simulation　comparison　with　the　conventional　PID　control　and　pure　fuzzy　control　method.　The　Fuzzy-PID　control　system　model　is　established　and　simulated　by　using　the　Simulink　tool　in　MATLAB.　According　to　the　simulation　results,　the　PID　parameters　can　be　adjusted　to　correct　the　system.　The　simulation　results　display　that　the　adjustment　time　of　the　Fuzzy-PID　thermostat　of　the　RFA　system　is　1.1635s　and　the　overshoot　is　4.55%.　Through　the　comparison　between　traditional　PID　controller　and　pure　fuzzy　controller,　the　simulation　results　testify　the　superiority　of　Fuzzy-PID　controller,　which　provides　a　direction　for　further　study　of　the　thermostat.