High-strength and High-aluminium Refractory Castables are refractory castables made of high-aluminum as aggregates and powders and added with binders. They have high temperature strength and load softening temperature, reduce thermal conductivity, and have good thermal stability. The furnace body structure has strong integrity and air tightness is better than brick furnaces, prolongs the furnace life, saves furnace repair costs, and has significant economic benefits.