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Six kinds of Cr2O3 - Al2O3 fused grains ( the mass percent of Cr2O3 was 15％,40％,50％,60％,85％ and 99％,respectively ) were prepared using chrome green and Al2O3 powder as starting materials by electrofusion,named as CR15,CR40,CR50,CR60,CR85,and CR99,respectively.The corrosion resistance of the six kinds of Cr2O3 -Al2O3 fused grains (4 - 1 mm) was studied using rotary slag corrosion method.The results show that:(1)the corrosion resistance of the fused grains increases with the Cr2O3 content and the grain size increasing; (2) the grains of CR99 and CR85 with higher Cr2O3 content are corroded at the slag surface layer,because FeO and Al2O3 in the slag corrode the grains ; FeO reacts with Cr2O3 in the aggregates forming ( Fe,Cr) 3O4 spinel firstly,and the spinel reacts with other phases forming composite spinel; when FeO is fully consumed,Al2O3 penetrated into the grains reacts with Cr2O3 forming Al2O3 - Cr2O3 solid solution on the grains surface; (3) for CR60,the corrosion exists both in the slag surface layer and in the penetration layer; in the penetration layer,CaO and SiO2 react with Al2O3 in Al2O3 - Cr2O3 solid solution forming anorthite,gehlenite,and glass phase; the grains of CR50,CR40 and CR15 have the same corrosion mechanism with CR60 in the penetration layer.