Abstract: The experiment uses acidic thiourea leaching solution as raw material,and investigates the effects of various factors on gold reduction rate in acidic thiourea leaching solution under the effect of additives and the optimal conditions are determined.At the same time,the kinetic study on the reduction of gold in acidic thiourea gold leaching solution by iron powder under the effect of additives is carried out,and the effects of reaction temperature on gold reduction rate and reduction kinetics are investigated.The result shows that synergistic system of iron power-sodium sulfite for gold reduction in acidic thiourea leaching solution can achieve 100.00 % reduction of gold under optimal conditions;the system will not introduce new impurities,can effectively reduce iron powder consumption,improve gold recovery rate while the tail solutions can be recycled;the reaction process of gold thiourea replacement by iron powder conforms to the first-order kinetic model and the rate control step of the reaction process is the diffusion process.