Abstract: Based on the analysis of ore ore properties,the author studied the gold leaching using preflotation-sodium thiosulfate flowsheet.Flotation reagents for sodium silicate,sodium sulfide,butyl xanthate,pine oil were 1800g/t,40g/t,80g/t,24g/t with one roughing and one scavenging.With preleaching (4h)-leaching (24 h)-five times washing process,normal temperature and pressure,slurry concentration 33%,0.10kg/t protective agent,sodium thiosulfate 10kg/t,additive concentration 0.76‰,ammonia 1.27%,lime 2kg/t,the final recovery rate of gold was more than 86%.This method was not only small toxicity,green environmental protection,but also provided technology feasible,economically reasonable process and conditions for the gold pilot recovery.