NOVELTY - Culturing composite bacteria, comprises (i) collecting activated sludge and precipitate from black odor water of municipal sewage treatment plant, and placing in incubators at constant temperature of 28-35 degrees C; (ii) amplifying the culture under aerobic condition, and adding two kinds of sludge samples to a liquid culture medium to constantly culture at 28-35 degrees C; (iii) screening domesticated species by adding mixed liquid of two kinds of sludge samples, and aerobically oscillating; and (iv) purifying the strain by inoculating good screened strain into activate enrichment culture medium.    USE - The composite bacteria is useful for removing nitrogen and phosphorus removal from black odor water (claimed).    ADVANTAGE - The method produces strain with rapid proliferation property; not only prevents the utilization of chemical purifying agent causing secondary pollution, but also does not require to protect the strain; and has processing efficiency much higher than the planting aquatic plants.    DETAILED DESCRIPTION - Culturing composite bacteria, comprises (i) collecting activated sludge and precipitate from black odor water of municipal sewage treatment plant, and placing in incubators at constant temperature of 28-35 degrees C; (ii) amplifying the culture under aerobic condition, and adding two kinds of sludge samples into a liquid culture medium to constantly culture at 28-35 degrees C for 2-3 days; (iii) screening domesticated species by adding mixed liquid of two kinds of sludge samples in a ratio of 1-3:1 into a screening domestication culture medium, aerobically oscillating at 28-35 degrees C for 2-3 days, where the required domestication period is 5-8 days, and inoculating fresh culture into 5-10 ml screening domestication culture medium after the end of each domestication period; and (iv) purifying the strain by inoculating good screened strain into activate enrichment culture medium, culturing at 28-35 degrees C for 2-3 days, subjecting the culture to centrifuging treatment, washing the culture using phosphate buffering liquid, and centrifuging to obtain bacterial strain suspension.