Abstract: Appling microbiology in traditional isolation and screening methods,14 strains were activated and preserved.And the test strains were stained,biochemical identified and the amylase strain screened firstly and screened secondly.The purpose of this test was to screen the strains producing amylase stronger,and the enzyme activity were identified.The results showed that among strains codenamed HZ9,HZ23 were lactic acid bacteria.Their capability of breaking down starch was relatively weak.But the HZ4 and HZ5 were bacillus.Their capability of breaking down starch was strong.The strains growth vigorously,metabolize strongly,and produce quickly at 37 ℃.The other strains did not have the degrading ability on starch.Thus,by screening to produce amylase and strong active strain were HZ4 and HZ5.