NOVELTY - Photosynthetic bacteria have a Rhodeopseudomonas palustris strain of 2-8. The preserving number of the Rhodeopseudomonas palustris is CCTCC M 205147.    USE - The photosynthetic bacteria are used for the biodegradation of a cinnamic acid and a benzoic acid, and for preparing a continuous cropping cucumber increase animalcule production fertilizer (both claimed). The photosynthetic bacteria can be used to control the content of nitrite nitrogen in aquaculture water body, to ameliorate environmental pollution, and to eliminate cinepazid diluted acid and benzoic acid; and used as nitrogen fixing biofertilizer, and as a continuous cropping cucumber growth promoter.    ADVANTAGE - The photosynthetic bacteria highly and efficiently eliminate the nitrite nitrogen (claimed), or can assimilate the nitrite nitrogen with high efficiency.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for (1) an industrialization culture medium used for the photosynthetic bacteria, comprising any one of the following prescriptions: (a) sodium acetate (0.2%), ammonium chloride (0.1%), disodium (0.05%), magnesium chloride (0.001%), ferric chloride hexahydrate (FeCl2.6H2O) (0.001%), zinc sulfate heptahydrate (0.0022%), sodium chloride (0.2%), yeast extract or peptone (0.1-0.2%), 10% sodium bicarbonate solution (50 mol/l), and ethanol (105-20 mol/l), where the pH is adjusted to 7.0 with 0.1N phosphoric acid; (b) sodium propionate (0.2%), ammonium chloride (0.1%), magnesium chloride (0.001%), FeCl2.6H2O (0.001%), zinc sulfate heptahydrate (0.0022%), sodium chloride (0.2%), yeast extract or peptone (0.1-0.2%), 10% sodium bicarbonate solution (50 mol/l), and ethanol (105-20 mol/l), where the pH is adjusted to 7.0 with 0.1N phosphoric acid; and(c) sodium succinate (0.2%), ammonium chloride (0.1%), disodium bisulfate (0.05%), magnesium chloride (0.001%), FeCl2.6H2O (0.001%), zinc sulfate heptahydrate (0.0022%), sodium chloride (0.2%), yeast extract or peptone (0.1-0.2%), 10% sodium bicarbonate solution (50 mol/l), and ethanol 105~20.mol/l, where the pH is adjusted to 7.0 with 0.1N phosphoric acid; (2) a method of eliminating the nitrite nitrogen in the aquiculture pond water by the photosynthetic bacteria, comprising producing the photosynthetic bacteria with any one prescription of the above culture medium, where the viable cell concentration of fermentation broth is up to 1011 cfu/ml; and spilling the dosage of 4 kg/mu m in the cultivation water of Litopenaeus vannamei, once per 10-15 days; (3) a rejuvenation method used for the strain with the elimination function of the nitrite nitrogen with high efficient, comprising making use of sewage sludge in a prawn pond and a pound pond, adding pond water and a prawn fodder, then sterilizing with high pressure and cooling, then adding the rejuvenation needed strain of Rhodeopseudomonas palustris 2-8 or other strain which can eliminate the nitrite nitrogen, anaerobic lighting culture for 2-6 days, and then preparing the strain with the high reductibility of the nitrite nitrogen; (4) a strain preserving method which keep the high efficient elimination function of the nitrite nitrogen, comprising using fresh mud in the sprawn or pound pond (200-300 g), putting the mud in 500 ml brine bottle, then adding 10 g Penaeus vannamei fodder, filling the brine bottle with the pound water or the sprawn pond water, then sterilizing with high press and cooling, then adding the rejuvenation needed strain of Rhodeopseudomonas palustris 2-8 or other strain which can eliminate the nitrite nitrogen, lighting culture for 3 days, then preserving in common temperature with dim light, and changing once a year; and (5) a method of bioassay which is used to estimate the photosynthetic bacteria or the strain with the familiar elimination function of the nitrite nitrogen, comprising using a double estimate system.