The insulating tile reinforcement was fabricated using mullite fiber,basalt fiber as main components and silica sol as binder.And insulating tiles/SiO₂ aerogels composite was prepared by infiltrating the silica sols into the insulating tiles via vacuum infiltration,followed by gelation,aging and supercirtical drying.The microstructure, thermal stability,and insulating properties of the composite were characterized and measured.The results show that with the increasing of the content of basalt fiber of the insulating tiles,the room-temperature thermal conductivitie decreased from 63 mW/(m•K) to 47 mW/(m•K),and the cold-face temperature dropped from 200 ℃ to 117 ℃ in the back-temperature tests heated at 600 ℃ for 15 min,due to the thinner diameter and infrared radiation containing materials of basalt fiber.However the linear shrinkage increased thus the thermal stability of the composition weakened,due to the remarkably low thermal stability of basalt fiber.