Malt extract is an indispensable ingredient in the production of jams, beverages, confectionery, beer, and pharmaceuticals. In this study, the effects on the quality of malt extract were investigated, including the time to harvest the rice germ, the mixing ratio between the rice germ powder and the glutinous rice, and the starch hydrolysis time. The results showed that the time to harvest the rice germ was after 6 days, the ratio of rice germ powder to glutinous rice was 1:5, and the incubation time for starch hydrolysis was 15 hours, helping the malt extract achieve good quality with sensory scores of 16.12 to 17.08. The dry matter content is 86.5%-87%, and the pH is 5. The malt extract is yellow, transparent, with a slight aroma of rice germ combined with glutinous rice, and has a sweet taste.