Abstract: A test for two kinds of high concentrative wastewater produced by benz sulfonic mythylate products was performed. The results show that the wastewater from benz-sulfonic chlorizate was treated by lime slurry neutralization and vacuum evaporation process, while the COD_Cr removal rate is 98.9% with influent COD_Cr 14,800 mg/L and effluent COD_Cr 161 mg/L;the wastewater from esterification was treated by caustic neutralization, vacuum evaporation, evaporating and fine-distilling methylalcohol process, while the COD_Cr removal rate is 98.6% with influent COD_Cr 109,000 mg/L and effluent COD_Cr 1,529 mg/L;83.2 t/a methylalcohol and 139 t/a benz-sulfonic natrium can be recovered from drained wastewater with a production scope of 400 t/a benz-sulfonic methylate, and in the mean time,308.7 t/a COD_Cr can be reduced.