Mullite-corundum castables has been developed by using ρ-Al2O3 instead of calcium aluminate cement as binder,with mullite and tabular corundum as main materials,adding a certain amount of white corundum fine powder,α-Al2O3 micro powder,SiO2 micro powder,kyanite,aluminum metal powder and steel fiber,as well as explosion-proof fiber,polycarboxylate superplasticizer and composite regulator.Such produced tundish cover has been applied in a steel works,whose service life is up to 21 cycles (185 furnaces),and 50%~60% higher than that of the traditional calcium aluminate cement bonded ones on average,meeting the requirements of continuous casting technology.