Using ceramic fibrous insulating tiles as skeleton, the alumina sols via sol-gel process were infiltrated into the tiles via vacuum infiltration, followed by gelation, aging and supercirtical drying to fabricate the aerogels impregnated high-temperature insulating tiles. The aerogel/tile composites' microstructure, thermal and mechanical properties at high-temperatures (up to 1400℃) were investigated. The results showed the composites exhibited a small linear shrinkage of 2% after hating at 1400℃ for 30 min.With increasing heating temperature, the aerogels' particles grew and condensed; the aerogels changed from filling the fibers' pores to being condensed, and to being mainly attached to the fibers' surface, but such evolution did not obviously affect the fibrous skeleton. After the aerogel impregnation, the specimen's room-temperature and high-temperature thermal conductivities decreased significantly, and the cold-face temperature dropped from 945℃ to 870℃ in the back-temperature tests. In addition, although the composites' room-temperature mechanical properties increased slightly, the high-temperature compressive strength drastically degraded at 1200℃ and 1400℃.