Purpose: high energy saccharifying enzyme screening of fine strains， Methods: by ultraviolet light and resurrection single spore suspension liquid alternant processing， use transparent circle and wave screening for early fermentation and screen， Conclusion: the strains isolated by 12， placebo-controlled trial flask， reached the enzyme 3 U/mL， starting 41% improved than strains， the effect is remarkable， breeding of the genetic stability test shows that strains have good genetic Key words: uv mutagenesis， Saccharifying enzyme， Aspergillus， Strain
