Abstract: High strength alloy steel is prepared by vacuum melting method, and the stress corrosion sensitivity is tested by slow strain rate tensile test. The results show that with the increase of material strength, the stress corrosion susceptibility becomes larger, and the fracture surface shows intergranular morphology, which belongs to brittle fracture. After the hydrogen charging test of different materials, the residual amount of H in slow tensile specimens increases with the increase of Mo content, which shows that Mo content has a certain effect on the residual amount of H.