In order to reduce the wastewater and improve the quality of the product, crude bisphenol S is purified by mixed solvents system of alcohol-tetrachloroethane or alcohol-anisole. Crude bisphenol S is dissolved in an alcohol. Then active carbon is added with tetrachloroethane or anisole under heating conditions. After a period of time of decolorization, the alcohol is removed by distillation. The high quality bisphenol S is obtained by filtration. The optimum conditions of alcohol – tetrachloroethane system are as follows. Firstly 10g crude bisphenol S is dissolved in 40g isoamyl alcohol. Then 100g tetrachloroethane and 1g active carbon are added under stirring and the whole system is heated under 50~60℃ for 1 hour. The alcohol can be removed from the filtrate by distillation after filtration. High quality bisphenol S can be obtained after the rest of the filtrate being cooled, filtered and dried. The mass fraction and yield of bisphenol S obtained by alcohol-tetrachloroethane are 99.50% and 82% respectively. The optimum conditions of alcohol - anisole system are as follows. Firstly 10g crude bisphenol S is dissolved in 40g isobutanol or isoamylalcohol. Then 60g anisole and 1g active carbon are added under stirring and the whole system is heated for 1 hour. The alcohol can be removed from the filtrate by distillation after filtration. High quality bisphenol S can be obtained after the rest of the filtrate being cooled, filtered and dried. The mass fraction of bisphenol S obtained by alcohol-anisole is more than 99.80%, and the yield of which is about 83%.