Abstract: Summarized here in the paper are the effects by the alloy elements，the manufacturing process and the microstructure of the steel on the SSC and HIC resistances thereof. It is regarded as follows. When designing the steel chemical composition，according to the effect by deferent chemical element on the SSC resistance of the steel，multi elements can be chosen，and added into the steel at the same time to improve the steel’s SSC resistance. Compared with the effect by the normal high temperature tempering process，the long-time，low-temperature tempering process or the double tempering process is possible to further improve the SSC resistance of the martensitic structured steel；and the SSC resistance of the steel will be also further enhanced by means of introducing the ferrite into the martensitic structure.Moreover it is worth trying to add proper amount of Element Cu into the steel and then conduct the critical quenching + the normal tempering process to get tempered sorbit-ferrite composite structure in a bid to make the steel have better strength and SSC resistance.