Abstract: Developed status of steels for nuclear reactor pressure vessel at home and abroad is presented including re- querulent for analysis and properties, metallurgical process, heat treatment, and present situation of manufacture and application. The developed trend of steels for nuclear power station is discussed, as the structure material technique is key technique for manufacturing nuclear reactor pile development of reactor to large-scale and integration, the steel SA508Gr4N which has higher strength-toughness and hardenability shall replace the current steel SA508Gr3 step by step.