Before grinding soybean milk, soybeans must be soaked for about 10 hour. According to different seasons, the soaking time is generally 6-9 hours in summer, 8- 12 hours in spring and autumn and 1 1- 16 hours in winter. You can soak soybeans before going to bed at night and use them the next morning. As the temperature rises, don't soak too many beans at once. Take a cup from the measuring cup of the soymilk machine, and ensure one dose. In addition, there are special soybean milk raw materials on the market, and the dosage of soybean milk ingredients with different formulas is divided into small bags, which is determined by nutritionists according to the best combination of taste and nutrition. For example, Sunshine Bean Shop is a non-GMO natural soybean milk bean made by Jiuyang, an industry brand of soybean milk machine. Select high-quality soybeans from Sanjiang Plain in Northeast China, carefully match healthy whole grains, and introduce soybean milk raw materials such as classic whole grains, rice flavor, organic whole beans, black beans and black peanuts, so that fragrant whole grain soybean milk is deeply rooted in people's hearts. It should be noted that soaking beans in hot summer weather, if more than 4 hours, is best put in the refrigerator. Because the soaked beans have high water content, it is easy to breed all kinds of bacteria. Bacteria do not produce aflatoxin, but may make beans have an unpleasant taste. In this case, pour out the soaked bean water before beating the soybean milk and rinse it several times to ensure the cleanliness and hygiene of the beans.