According to narrow hardenability range, low oxygen content and hing purity of gear steel 20CrMnTiH5, Optimizing the chemical compositon of production and applying “quaternity” advanced technology. Enhancing deoxy-operation and excluding inclusion in smelting process and controlled rolling and cooling process in rolling process, using a combination of infrared flaw detection and grinding for controlling product surface , The products quality has reached a high purity, fine grain , homogeneous, narrow hardenability with surface defects in a high quality level.