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A group function relation curve between flux (J) and bulk phase concentration of substrate ( S ) was set up. The biodegradation kinetic of organic compounds of acrylic fiber wastewater in biofilm is studied ( the treatment technology is coagulation/sedimentation-anoxic/aerobic biofilm process), and the results showed that the concentration of non-degradation pollutants in effluent is 77 mg/L. In aerobic zone,corresponds to the fact that there are some biorefractory compounds in the wastewater.