Corrosion resistance of ceramic substrate glazes to molten aluminum was studied in this paper. The glazes can spreadslightly in aluminum alloy according to SEM examination of solidified interface between the glazes and aluminumalloy. The components of B2O3-P2O5 glazes were not detected with electron probe at the side of aluminum alloynear the interface, but the components of boron-free glaze were detected. It is shown that borophosphate glazes canresist the corrosion of molten aluminum.