Abstract: Abstract:This study investigated the characteristics of rapid changes of quality and quantity, poor ratio of ρ(BOD₅)/ρ(COD_Cr) and high color of printing and dyeing wastewater. We conducted a study on printing and dyeing wastewater (i.e., the outflow of adjusting tank in wastewater plant where the percentage of printing and dyeing wastewater is greater than 90%) treatment with ABR under condition of 2 L/h, and focused on the removal effects of COD_Cr and color, and the improvement of ρ(BOD₅)/ρ(COD_Cr) after ABR treatment. The results indicated that:1) When average inflow ρ(COD_Cr) was 517 mg/L, color was 380 and ρ(BOD₅)/ρ(COD_Cr) was 0.20. With the shortened HRT (32,4, 18,4 and 10 h), average removal rates of ρ(COD_Cr) ranged from 46.1% to 22.5%, average removal rates of color changed from 60.6% to 51.0% and improvements of ρ(BOD₅)/ρ(COD_Cr) varied from 0.39 to 0.30.2) With compartments increased, COD_Cr and color declined gradually. ρ(COD_Cr) and color of the first compartment occupied the interval values 20.0% and 51.0% of the total removal rate, respectively, which could be confirmed by Uv-vis absorption spectrum scan. 3) The pollutant species within the effluent decreased significantly. All of the anaerobic hydrolysis acids were removed and lipids were significantly reduced, which indicated that the ABR treatment had good ability of anaerobic hydrolysis. The outcomes of this study create a foundation for subsequent aerobic processes.