Using Brevibacterium actfermentum as production glutamate strain and metagenizing with nitrosoguanidine and diethyl sulfare, we obtain a multicharacter strain with inheritance charater AHVr+αABr+2Tar+Leu++Met-+Ileu-. Controlling the glucose concentration, the SCL concentration, and the soybean hydrolystate concentration; adjusting the ventilating quantity, temperature, and pH value in the 30Tone fermentation tanks, we acquire the LValine productivity of 3.0%-3.5% with. Under...