The specimens were prepared with high alumina fiber accounting for 0,5%,10% or 15% by mass of the total amount of amorphous silica and high alumina fiber,using phenolic resin as binder,and extra-adding 0 or 0. 5% ZnO as sunscreen to cut the cost of SiO_2 nanoporous insulation board. The hot volume stability and thermal conductivity(flat plate method) of the specimens were tested and multi-function simulation equipment was used to study the thermal insulation performance. The results show that:(1) with high alumina fiber addition increasing,the linear shrinkage rate decreases,but thermal conductivity changes a little;(2)adding ZnO can decrease thermal conductivity obviously;(3) for the specimen with ZnO and 15% of high alumina fiber,its cold face temperature hardly rises during the simulation experiment at 1 000 ℃ for 2 h,and the cold face temperature of the specimen with the smallest thickness of 2 cm doesn't exceed 180 ℃.
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