The soaking of polished rice with water at 25℃ for 12 hours facilitated the subsequent cooking of rice, the moisture content of swollen rice after soaking was 32.5%. The optimum condition for koji-making was as following: the cooked rice inoculating with Aspergillus awamori was incubated at 30℃, 90% RH, with proper aeration for 2 days. The amylase and protease activity of rice-koji were 96 and 0.8U/mL, respectively.