The　characteristics　of　a　new　kind　of　liquid　natural　circulating　radiator　with　fin　charged　with　R11,　R113　and　R123,　respectively,　are　experimented,　and　the　influences　of　charging　rate　on　the　radiating　effect　are　discussed.　The　results　demonstrate　that　the　radiator　owns　favorable　performances,　and　it　is　able　to　keep　the　temperature　in　junction　layer　of　the　die　steady.　For　R123,　R11　and　R113,　the　performance　of　R123　is　the　best　and　the　optimum　charge　ratio　is　between　80%　and　100%.