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The chrome-containing corundum castables specimens with different nano-CaCO3 additions (0-1.6 wt% ) were prepared using tabular corundum, alumina powder, chrome oxide micropwder (average particle size＜5 μm), calcium aluminate cement(Secar71), commercial nano-CaCO3(average particle size＜100 nm) as main starting materials and FS10 as water reducer. The specimens heat treated at 1 000 ℃ and 1 600 ℃ were characterized in terms of apparent porosity, bulk density, cold and hot strengths,and microstructure. The results show that, when the nano-CaCO3 addition is no more than 1.0 wt%, the apparent porosity of the castables increases with nano-CaCO3 addition increasing, both the cold and hot strengths are enhanced;however, when the nano-CaCO3 addition excesses 1. 0wt% , both the cold and hot strengths go down remarkably with nano-CaCO3 addition increasing; the thermal shock resistance is gradually improved with nano-CaCO3 addition increasing in chosen range.