Abstract: Based on the results of metallographic examinations as well as relevant verifying tests, performance tests and influencing factor analysis of the materials sampled from different batches of the products, this paper reveals the characteristics of the 1Cr15Co14Mo5VN ductile-toughness, which is very sensitive to the heat treatment process. The study also shows the sensitivity of the products manufactured with 1Cr15Co14Mo5VN to surface defects and stress concentration due to the lower crack resistance of the material. Therefore, it is suggested to improve the product design and the material. Analysis indicates that the fracture toughness and the ductile-toughness of 1Cr15Co14Mo5VN can be increased by measures such as adding Ni and Nb, using double vacuum smelting, and increasing the solution temperature.