Abstract: In this study,incineration leachate with high dissolved organic matter (DOM) was treated by combined process anaerobic-aerobic-coagulation.The leachate average effluent ρ(COD_Cr) of the combined process was 208 mg/L when the average influent ρ(COD_Cr) was 10,800 mg/L.The changes of ρ(COD_Cr) corresponding to different molecular weight (MW) distributions of DOM and the DOM fractions in each process unit were also investigated.The results showed that the COD_Cr removal efficiency was larger than 94.7% when the DOM MW was less than 50 ku,and the removal efficiency could reach 99.0% when the MW was less than 2 ku.The removal efficiencies of DOM fractions,humic acid (HA),fulvic acid (FA) and hydrophilic (HyI) exceeded 90.0% using the same combined process.It demonstrated that the combined process was feasible for the treatment of incineration leachate.