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With the exhaustion of nickel sulfide ore resources, nickel laterite ores will be the main feedstock for the nickel production, and in China, some laterite ores are smelted in blast furnce.1,2) Compared with the ordinary iron ore used in ironmaking, laterite ore is a low-grade ore which contained a certain amount of oxides, such as TiO2, Cr2O3, MnO and so on. In order to use more laterite ores in blast furnace, it is important to understand the effect of these minor oxides on operations of blast furnace and properties of slag. In our previous study,3) the effect of Cr2O3 on the viscosity and structure of high-Alumina slag has been clarified. However the influence of MnO on the property of high-Alumina slag has not been completely clear. The viscosity of CaO–SiO2–MnO slags has been measured and calculated using viscosity estimation models by Ji.4) Park et al.5–8) studied the relationship between structure and property of CaO–SiO2–MnO slag, indicating that the properties such as viscosity, density, electrical conductivity and sulfide capacity are significantly dependent on the influence of MnO on the degree of polymerization of slag networks. Kim et al.9) revealed the effect of MnO on viscosity and structure of TiO2–MnO–SiO2 welding fluxes. Deng et al.10) found that the addition of MnO could reduce the viscosity of La2O3–SiO2–Al2O3 slag. Zuo et al.11) investigated the viscosity of CaO–SiO2–MgO–Al2O3–MnO slag systems and the wetting behaviour between slag and refractory, the results showed that the slag viscosity decreased and Effect of MnO on High-Alumina Slag Viscosity and Corrosion Behavior of Refractory in Slags