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Malodorous black water body is always with high organic contents under extreme anaerobic conditions and has pungent smell. With the large amount of living pollution entering rivers and lakes, water eutrophication occurs, and the water body gradually evolves into malodorous black water body, which seriously affects the safety of water quality and the health of humans. Biochemical method has been considered as the most economical and efficient method for the treatment of malodorous black water body. In this study, the directional screening technology of bacterial biofilm was used for the first time, and a variety of degrading strains of malodorous black water were obtained from various heavily polluted waters. Ammonia nitrogen removal efficiency of three strains was more than 60%, and the Chemical Oxygen Demand (COD) removal efficiency was over 75%. Through the mixed culture of the three kinds of bacteria, the removal efficiency can be improved. Optimized degradation conditions of mixed bacteria were as follows: with pH of 7, dissolved oxygen concentration of 2.5 mg/L, temperature of 30°C, the total bacterial concentration of 15%, the initial COD of around 50 mg/L, and the initial ammonia nitrogen of about 17 mg/L. Ammonia nitrogen and COD were totally degraded in 50 h, and total phosphorus degradation efficiency was also more than 80%. This research provides novel insights for the treatment of malodorous black water. [ABSTRACT FROM AUTHOR]