Abstract: For difficult and complex process of dyeing and printing wastewater treatment, in order to improve the efficiency, The technological conditions of the dyeing and printing wastewater treatment by Coagulation-adsorption-oxidation were studied．The result showed when adjusting the pH of the wastewater to 5,using 1000mg/L PFS, reacting for 1 min with 350r/min agitation and 15min 60r/min agitation and standing for 30min，the effluent using 20g/L activated carbon and 0.2μL/mL H2O2 reacting for 60 min with 350r/min agitation by 25℃， the index of the effluent: COD was 119mg/L, the color degree was 39 folds. The rate I according to GB4287-92 of the color degree was attained, the others was rate II.