Thereductionofradiationtransferisthekeytoimprovethermalinsulatingpropertiesofnano silicaporousthermalinsulating materialathightemperatures.Theeffectofzircononthermalinsulating propertieswasinvestigated.Theresultsshowthattheintroductionofmicro-zirconcangreatlyreduceIRradiationtransferandimprovethermalinsulatingpropertiessignificantlyathightemperatures. Whenzircon withmassratio35%isadded,thermalconductivitycandecreasefrom0.119W/(m·K)to0.053W/(m·K) at500℃.Inaddition,themechanismofIRopacificationofzirconisalsodiscussedandanalyzed