L-glutamate acid,is based on the quality of sugar as raw materials by microbial fermentation, using isoelectric point extraction with exchange resin; means the separation obtained. L-glutamate acid is a scale-like or powder-like crystals. It is slightly acidic, and non-toxic. slightly soluble in cold water, soluble in hot water, almost insoluble in ether, acetone and acetic acid in the cold, not soluble in ethanol and methanol. at 200 when the sublimation, 247 -249 decomposition, density 1.538g/cm3, specific rotation +37- + 38.9 (25 ). L-glutamate in food, medicine, cosmetics and other fields have applications, widely used in the production of sodium glutamate (MSG), L-threonine,, poly glutamic acid and so on.