Current　studies　on　security　of　IOT　are　mainly　concentrated　in　the　detection　and　control　of　behaviors　of　sensing　nodes　and　neglect　the　protection　of　the　key　components　of　sensing　nodes.　So　that　sensor　nodes　may　be　destroyed　and　don＇t　function　when　malicious　behaviors　are　detected.　To　solve　this　problem,　in　this　paper,　we　apply　trusted　computing　to　study　the　security　of　Internet　of　things　and　propose　the　trusted　immune　system　of　the　sensing　network.　The　trusted　immune　system　not　only　just　guarantee　the　trust　of　behaviors　of　sensing　nodes,　but　also　guarantee　the　trust　of　the　key　components　of　sensing　nodes.　By　implementing　immune　surveillance,　immune　defense　and　immune　homeostasis,　the　trusted　immune　system　of　the　sensing　network　provides　initiatively　immune　support　for　the　sensing　network　combining　with　macro　and　micro.