Organosilicon defoamer is widely used in many fields, such as glutamic acid, lysine and so on. It is also used in textile, printing and dyeing, coating, dyestuff, papermaking, ink, oil field, sewage treatment and other fields. When it is used in printing and dyeing, it has good compatibility with additives in dyeing bath, and does not affect color light and dyeing fastness; it is used in defoaming of polyester fabric in high temperature dyeing process and fermentation process; it is used in defoaming of fermentation and sugar production in food industry; in addition, it can also be used in defoaming of diethanolamine desulfurization system and defoaming of various oil, cutting fluid, non freezing liquid, water-based ink and other systems Foam is also suitable for defoaming of uncured resin after plate making of photosensitive resin in printing industry. It is a representative, excellent performance and widely used silicone defoaming