NOVELTY - Producing lysine involves adding corn starch amylase, hydrolysis the starch liquefied by liquefying, and saccharifying to glucose via enzyme; taking glucose, culturing nutrient at 126-130 degrees C, connecting to kill bacteria, and fermenting; carrying out primary separating and secondary separating, filtering and resin ion exchanging; using ultrafiltration membrane to filter the liquid; concentrating, crystallizing the resin ion exchange to obtain crystal; separating to obtain the crude product of amino acid; and drying crystalline lysine.    USE - Lysine is used in food, stimulates pepsin and gastric acid secretion, improves appetite and anemia, promotes children's growth and development, improves absorption of calcium and accelerates bone growth. Lysine is also used as a diuretic, for treating lead poisoning in blood and for treating hypertension.    ADVANTAGE - The method provides a lysine which saves resin ion exchange, concentrating and crystallizing steps, and has a purity of 65-90%; has high production efficiency; and is environment-friendly and energy saving.    DETAILED DESCRIPTION - Production of lysine involves adding corn starch amylase, hydrolysis the starch firstly liquefied by liquefying, and saccharifying to glucose via enzyme; taking glucose, culturing nutrient at 126-130 degrees C, connecting to kill bacteria, and keeping that for 10-20 minutes, then putting in the fermentation tank to ferment, and the supplementary air inlet oxygen; carrying out primary separating and secondary separating, filtering and resin ion exchanging, where the primary separating is carrying out with the fermented lysine fermentation liquid in a centrifuge, accelerating the sedimentation speed of particles in the liquid, and separating and washing the protein and different sediments in the fermentation liquid; then using a ultrafiltration membrane to filter the liquid with primary separating, proceeding the exchange of resin ion, obtaining by-product and separating the sewage; concentrating, crystallizing the resin ion exchange after the solution and concentrating to obtain crystal, and then separating to obtain the crude product of amino acid; drying crystalline lysine by a push-type centrifuge, by the hot air to make the material fluidized state, and the heating plate in the heating device to make the material boil, fluidizing the material circulating device caused by a heating plate and a steam port of the hot air are heated and dried after cooling by fluidized into a cooling device, the cooling plate and air inlet to fluidized bed dryer after cold air by cooling, discharging opening, drying of large grained material and water is discharged through the outlet, and product packaging and warehousing the lysine.