Abstract: Solidification defects are easily formed in the large-width continuous casting billet of high C/Cr bearing steel. To address this problem, a continuous casting billet with a width of 1150 mm and a thickness of 230 mm was manufactured using optimized electromagnetic stirring and secondary cooling parameters, and its low magnification morphology, microstructure, composition distribution, and internal defects were characterized to provide a basis for the optimization of continuous casting process. The results show that there is a significant difference between the outer and inner of the casting billet, and the "ingot core" with obvious segregation and defects accounts for about 1/3 of the casting billet thickness. The original austenite grain size in the casting billet ranges from 200 μm to 500 μm, and its interior is a fine layered pearlite structure with few columnar grains. Continuous carbides precipitate at the grain boundaries. Liquid precipitated carbides are formed at the grain boundaries of the core of the casting billet, with a high Cr content and solidification porosity, but the range does not exceed 10 mm. The composition is uniform within the thickness range of the casting billet. Therefore,through properly controlling the casting speed and the cooling conditions, combined with electromagnetic stirring, serious defects that cannot be eliminated in the subsequent hot processing can be avoided.