The GB/T 34681-2017 standard specifies the method for measuring the compatibility and recoatability of coatings in practical applications of Paints and varnish. The standard mainly focuses on the compatibility of coatings in different coating systems and their performance in the case of recoating. Through the test of this standard, the adhesion, durability and Appearance changes of coatings during sexual repeability coating can be evaluated to ensure the overall performance and Stability of the coating system. This standard provides scientific evaluation basis for Coating manufacturers and users to help optimize the coating process and improve the mass of Coating products.