Water-soluble anti-hydrolytic polyester is a new material developed by our company since 2012. This product is a kind of environment-friendly water-based paint.It overcomes the defects of solvent-based and water-based paint such as poor water resistance, poor weatherability and pollution. At the same time, the product also abandoned the use of crosslinking reaction route when curing water-based paint, but directly reacted with water resistant polyester of high molecular weight in water, and finally formed a product with good water solubility and water resistance. The product is used widely in water-resistant materials and has great difficulties in development. It has a broad prospect in the fields of water-based paint,insulating paint, ink, building paint etc..It is the original product of our company and the related patent is being applied for.