Thiourea method can realize effective extraction and simplify the extraction process of gold and silverby utilizing thiourea solution as leaching agent and electrodepositing gold and silver from the thiourea leaching solution.Sulphuric acid solution containing Fe 3+5 g/Lthiourea(TU)50 g/L and pH=1 is used to leach goldsilver from pure goldpure silver and copper anode slim.The main thiourea complexes of silver and gold in the resulting leaching solution are ［Ag(TU)4］ +［Ag(TU)3］ +and ［Au(TU)2］ +.The cyclic voltammograms of thiourea leaching liquid shows that the initial reduction potential of Fe 3+H +［Au(TU)2］ +［Ag(TU)4］ +and ［Ag(TU)3］ +are 0.15V-0.25V-0.32V and -0.36V respectively.So gold is electrochemical reduced precipitation prior to silverthen reduced with silver togetherand in company with H +RSSR and other metallic impurities are reduced.However H2 evolution on cathode is the main reason for reducing the current efficiency.