Soybean products production pulp process will produce a large number of foam, the subsequent production operation is extremely unfavorable, in order to maintain normal production is often used to defoamer defoamer. At present, domestic and foreign antifoaming agent has begun to use the following four: (1) oil foot: oil foot is fried food waste oil or soybean oil after the settlement of the slag, which contains more impurities, dark color, unhygienic, but the price is cheap, small artisanal workshops more use of this antifoaming agent. (2) oil foot paste: oil foot paste is made of sour grease mixed with calcium hydroxide paste, oil foot and calcium hydroxide ratio of 10:1, the use of 1.0%. (3) Silicone organic resin: Silicone organic resin is a kind of antifoam agent developed and used in recent years. It has high thermal and chemical stability, low surface tension and strong bubble-breaking ability. (4) fatty acid glycerol: divided into distilled products (purity of 90% or more) and undistilled products (purity of 40% to 50%). Distilled products for the use of 1.0%, when used evenly added to the soybean milk, can be heated together. Now there are soy products on the market special antifoaming agent products, the main ingredients for the distillation of monoglycerides and so on.