NOVELTY - An amino acid is fermented by formulating liquid medium which is composed of amino acid wastewater with high salt content, adding 1.5-2.5% mass-to-volume ratio solid agar medium, feeding activated yeast Debaryomyces, inoculating into continuous sequence subcultured solid medium with different concentrations in which culture temperature is 15-35 degrees C, gradually increase tolerance of bacteria in which amount of amino acid wastewater with high salt content is 45-55 mass%, and subjecting 0.5-5% amino acids wastewater with high salt content into fermentation medium and processing.    USE - Fermentation of amino acid (claimed).    ADVANTAGE - Product has high concentration of salt-containing amino acid wastewater as nitrogen source which promotes fast growth and reduces production cost, chemical oxygen demand value of wastewater, and sewage treatments.    DETAILED DESCRIPTION - An amino acid is fermented by formulating liquid medium which is composed of amino acid wastewater with high salt content, adding 1.5-2.5% mass-to-volume ratio solid agar medium, feeding activated yeast Debaryomyces, inoculating into continuous sequence subcultured solid medium with different concentrations in which culture temperature is 15-35 degrees C, gradually increase tolerance of bacteria in which amount of amino acid wastewater with high salt content is 45-55 mass%, subjecting 0.5-5% amino acids wastewater with high salt content into fermentation medium and processing at 15-35 degrees C with speed of 100-300 rpm/minute in which ventilation coefficient is 0.2-0.8, fermentation time is 2-7 days, collecting product and subjecting to centrifugation at 4000 rpm/minute for 10 minutes, and placing collected cells into oven at 70 degrees C and drying to constant weight in which product wastewater contains 75-150 g/L nitrogen content, 150-300 g/L amino acid content, and 80-180 g/L chloride ion content, Debaryomyces is Debaryomyces hansenii strain with preservation number of CGMCC No. 2.33, amino acid wastewater with high salt content concentrations are 125 g/L, 250 g/L, 330 g/L, 400 g/L, and 500 g/L, preferably 125-330 g/L, and amino acid wastewater with high salt content contains chemical substrate which is composed of 30-140 g/L, preferably 30-100 g/L carbon source, 5-22.5 g/L, preferably 5-15 g/L potassium dihydrogen phosphate, 3-15 g/L, preferably 0-10 g/L yeast, 3-13.5 g/L, preferably 3-9 g/L magnesium, and 1.5-6 g/L, preferably 1.5-4 g/L ferrous sulfate in which chemical substrate pH value is 3.5-7.5 and carbon source is composed of glucose, sucrose, molasses, enzymatic hydrolyzed corn starch solution, sweet potato starch, and/or enzymatic hydrolyzed tapioca starch.