The application range of defoamers used in the construction industry is extremely wide, covering almost the entire life cycle of building materials. From concrete mixing plants, coating production lines to on-site construction processes, defoamers play an indispensable role. Specifically, it is widely used in concrete water reducers to improve the strength and durability of concrete; In the production of coatings, ensure that the coating is flat and smooth to enhance the decorative effect; In adhesive manufacturing, preventing the generation of bubbles and enhancing adhesive strength. In addition, defoamers also play an important role in fields such as insulation materials, waterproof materials, and tile adhesives. This article will elaborate on these application areas and their specific needs, showcasing the diversity and importance of defoamers used in the construction industry.