Rust removal and spraying of hydraulic steel gate is an important link in gate manufacturing.Based on the corrosion principles and hazards of hydraulic steel gates and common anti-corrosion measures for hydraulic steel gates,the spraying methods,construction technology,specific requirements and inspection standards were discussed.Taking the reinforcement project of Bojilixi Yellow River diversion sluice as an example,the anti-corrosion effect of arc welding spraying which adopted coating sealing anti-corrosion treatment technology additionally was analyzed.The results showed that after 6 years of operation,the qualified rate of anti-corrosion coating thickness for each component of the flat steel gate of the Bojilixi Yellow River diversion culvert gate was 100%,far exceeding the current standard requirement of 85%,and the anti-corrosion effect was good.