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Arsenic contamination of water and associated health risks have been reported in many parts of China.Leaching of arsenic from industrial wastewater into groundwater may cause severe contamination, which requires proper treatment before its emission.Because of this reason, sulfur dioxide reduction combined diffusion dialysis method is adopted to dispose the wastewater containing high concentration of copper and arsenic.Effects of the sulfur dioxide reduction process of the flow of sulfur dioxide, reaction time, reaction temperature and stirring speed and the diffusion dialysis process of the influent acidity,water flow velocity and material flow velocity on the ratio of separation of arsenic and copper were studied.