Abstract: In this paper, a bacterium strain with high-efficient ramie degumming , named Dazu5-1, was isolated from field soil by iterative enrichment,screening and rescreening methods. When the strains are used for 2d fermentation degumming of ramie, the average weight loss rate can reach 30.2%. Compared with the chemical degumming, Dazu5-1 strain degumming can make the average value of single fiber strength of ramie increase by 76.93%. Finally, the Dazu5-1 strain is identified as Shigella by morphological observation, physiological and biochemical indexes determination, 16SrDNA base sequencing and homology analysis.