Abstract: wild strains of moulds were selected from23soil samples.Among themthere were10strains exhibiting higher sallharification effecfon s tarch.It was pointed that the enzyme activity of A -4(2),C and E6 had reached the highest activity,i.e,1125.2,825.1and825.1respectively,By inducing mutation c -strain withultraviolet ray ,two positive great mutationstrains c (1) andC(5) were obtained.Incomparisonwith th ose before inductionof mutation,th e activity of raw -starchsaccharifying enzyme (R?S?S?E)in C (1) was increasedby27.3%.In the same condition,the alcoholicdegree hadincreasedto22.4%.Bythealcoholicfermentationtest ofrawstarch,as inC (5) ,theactivityofR?S?S?Ewas increased by12.1%andalcoholic degree by5.97%.

Key words: Non -steaming , Raw -starch -digestio nglucomy lase , Moulds , Selective breeding