Effects of gibberellin on alpha and beta-amylase activities of Aspergillus orygae var. microsporus have been studied. Results obtained are as follows: 1. The growth of mycelium and dry weight of surface ped was accelerated by 0, 0001% gibberellin solution, spores of Aspergillus oryzae var. microsporus. were preveously soaked for three days. 2. Adding to culture media with 0, 0015% gibberellin, alpha-amylase was increased 50% much as beta-Amylase was as much as 50%.