Soymilk is a milky white liquid, which is a drink made by grinding soybeans and mixing them with water. Soymilk is a favorite drink and a nutritious food for all ages, enjoying the reputation of "plant milk" in Europe and America.

Bean juice is actually the leftover of mung bean starch or vermicelli. Soak mung beans until they can be twisted and peeled, take them out, add water, grind them into fine pulp, and pour them into vats for fermentation. What sinks in the bottom of the vat is starch, and what floats on it is bean juice. It has the characteristics of gray-green color, thick bean juice and slightly sweet taste. Bean juice is a popular snack with unique flavor in Beijing in winter and spring. Especially the old Beijingers have a special preference for it.

Generally speaking, soybean milk is the juice that beans come into contact with. Bean juice is the remaining water for making tofu.