During the hot and cold rolling processes, the deformation ability of the non-metallic inclusions had a significant influence on the performance of steel products, such as strength, toughness, and corrosion resistance. Evaluation methods and influencing factors for the deformation ability of non-metallic inclusion were investigated. Physical properties of the non-metallic inclusion, i.e., melting temperature, viscosity, thermal expansion coefficient, and Young’s modulus, had a strong influence on the deformation ability, which was relative to the chemical composition of the nonmetallic inclusion. Several technologies were developed to control the composition of inclusions by modifying inclusion composition in the molten steel, including calcium treatment and slag refining. Exploring advanced technologies for the precise control of inclusions and steel quality enhancement should be considered.