The high鄄temperature thermophysical parameters measurement of SiO2 aerogel were investigated by
plane source鄄stepwise transient method. The thermal conductivity, thermal diffusivity and thermal capacity of the SiO2
aerogel at different temperature and pressure were obtained. The results showed that the thermal conductivity of SiO2
aerogel increase 62% compared with RT. In the same pressure, the thermal capacity has an important effect on ther鄄
mal conductivity below 600益, but when the temperature is over 600益, the thermal diffusivity has an important
effect. In the same temperature, the thermal conductivity is affected by thermal diffusivity over 10 kPa.