Influence　of　radiation　on　the　temperature　in　HTAC　is　numerically　analyzed　in　this　paper.　The　results　of　four　cases　for　discrete　transfer　model,　P-1　model,　Monte　Carlo　model　and　non-considered　radiation　model　are　obtained.　Comparing　the　numerical　results　with　the　experimental　results,　evaluation　on　four　different　models　is　given　in　this　paper.　It　could　be　seen　from　the　results　in　this　paper　that　the　radiation　must　be　considered　in　the　calculation　and　the　results　ignoring　radiation　could　not　meet　the　practical　application.　The　radiation　models　need　to　be　improved　further　with　the　development　of　numerical　method　and　computer　technology　so　that　the　error　could　be　decreased　greatly　and　the　numerical　results　could　satisfy　the　practical　application　very　well.