According to the cyanide tailings characteristics in a gold mine,inco method is used to carry out experimental research on the detoxification treatment.The experiment optimized the influence factors including the sodium metabisulfite dosage,reaction time,pH,gas-liquid ratio and slurry concentration.Under the optimal conditions,the total cyanide mass concentration of toxic leachate decreases to 0.191 mg/L after treatment,and the removal rate of cyanide is 98.5 %,meeting cyanide tailings pond disposal standard by HJ 943—2018 Technical Specification for Pollution Control of Cyanide Leaching Residue in Gold Industry.