Abstract:For the purpose of screening strains with high-efficiency degradation of kelp，20 strains of Bacillus were isolated and purified from the surface of fresh kelp.Twelve strains of Bacillus were obtained by screening and measuring the viscosity of fermented kelp.The detection of the characteristic active constituents of seaweed polysaccharide，fucose and alginic acid in kelp fermentation broth showed that Bacillus siamensis D3 could efficiently degraded and released the active ingredients in kelp.After the kelp was fermented by the strain，the yield of seaweed polysaccharide reached（36.09±0.07）%，the fucose yield was （11.95±0.03）%，and the alginic acid yield was（34.68±4.37）%.The above experimental results showed that Bacillus siamensis D3 could extract and release the active ingredients in kelp，and the fermentation process is green，safe and efficient.The discovery of this strain will be the development of feed，functional food，medical food and cosmetics with kelp as raw material.The comprehensive and efficient use of kelp provides excellent probiotic fermentation strains.