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After running for a long time, fan impeller, inlet box, air inlet, and fan casing of mine ventilation main fan are corroded seriously. Thus is a threat to safe operation of main fans, which increases running resistance and reduces efficiency. Therefore, main fan corroded can't meet actual needs of field-work. China's scientific research institutes and related businesses have carried out a lot of research and development on energy-saving and benefit-increasing of mine ventilation main fan since 1990's. Successful experience and method has been widely used in many mines. The design focuses on technical scheme of energy efficiency by means of surface anti-corrosion treatment. Such as choosing rationally and installing main fan in accordance with relevant national norms, analyzing its corrosive environment and carrying out anti-corrosion design.