Bacillus natto is usually (0.7-0.8) um × (2.0-3.0) um, Gram-positive. When environmental conditions are not suitable for cell growth, it can form spores, spores oval or cylindrical, in raw or partial school students, even if the cyst enlargement, not significant, flagellated, motile. Cells grown in glucose agar protoplasm stained uniform. The growth temperature up to 45-55 ℃, the lowest for 5-20 ℃, optimum growth temperature of about 37 ℃. Spores of Bacillus natto is a type of acid, heat resistance of bacteria in gastric four hours, the survival rate was 100%. Bacillus natto fermentation process to produce a viscous substance specific polypeptides and polysaccharides formed, but also produces a strong fibrinolytic activity of serine proteases - nattokinase. Bacillus natto has good antibacterial properties. In vitro studies showed that adding Bacillus natto make acidification beneficial intestinal absorption of iron, calcium