Abstract: This article mainly studies the effects of adding a certain amount of N and Cu elements on the structure and properties of 0Cr13Ni4Mo steel. By using the same heat treatment system, materials with different N and Cu contents are heat treated, and then tested and analyzed for room temperature tensile,room temperature impact,hardness, and microstructure. The results show that, under the same heat treatment system, after adding N and Cu elements, the content of delta ferrite and carbide is significantly reduced, the tensile strength of the material is increased by more than 70MPa, the hardness is increased by more than 20HBW, but the impact toughness is reduced by more than 50%; When adding N element alone, the content of delta ferrite and carbide also decreases, the tensile strength of the material increases by more than 50MPa, the hardness increases by more than 15HBW, and the plasticity and toughness are equivalent to when N and Cu elements are added at the same time. Conclusion, Affected by the N and Cu elements, especially the N element, the stability of the austenite of the material is significantly increased, inhibiting the precipitation of delta ferrite and carbide; at the same time, because the N and Cu elements have solid solution strengthening and The age strengthening effect significantly increases the strength and hardness of the material; however, due to the increase in the N element content, nitrides precipitate along the grain boundaries during the tempering process, resulting in a decrease in the plasticity and toughness of the material.