Due to the special composition of unsaturated polyester paint,the unsaturated polyester resin and styrene in its formula are prone to self-polymerization,which will lead to product gelling and deterioration.Therefore,the storage stability of unsaturated polyester paint is much worse than that of polyurethane paint and nitrocellulose paint.The factors that cause gelling in the unsaturated polyester paint system were analyzed.Combined with experimental data,it provides reference experience for the paint industry to design and develop unsaturated polyester paint to improve product storage stability.