Abstract: The leaching-extraction-electrowinning technology is applied in the experiment of comprehensive utilizing tailings in flash smelting furnace.The research results demonstrate :the leaching rate of copper is 60.35% in the leaching of adding an additive A with low acid.Fe of leaching tailings left in leaching residues and not enter into the solution in the leaching process.The copper content of raw tailings in leaching residues decrease to 0.24% from 0.63%, can meet the copper content requirement of iron concentrate in smelting iron.The leaching residues can be sold as the raw materials of iron concentrate.The recovery of copper is about 60% in copper leaching solution by extraction-electrowinning technology.The quality of cathode copper accord with No.1 copper standard of state.