Using casein plate and carboxymethylcellulose sodium(CMC-Na) plate screening method,ten protease activity producing Bacillus Subtilis Natto strains(NY-1 to NY-10) and ten cellulose producing Bacillus Subtilis Natto strains(NS-1 to NS-10) were screened from Beijing,Dalian and Japanese Natto.NY-1 and NS-1 were selected from the examined strains for their highest protease activity and highest cellulose activity,respectively.NY-1 and NS-1 were studied with respect to their biological characteristics,including g...