DS/EN ISO 22969 "Paints and varnish - Determination of solar reflectance" standard specifies the method for measuring the solar reflectance of Coatings. The solar reflectance is an important indicator of the solar reflection radiation ability of Coatings surfaces, affecting the thermal load, energy efficiency and Environmental temperature of buildings. The standard calculates the solar reflectance of coatings by using Light spectrum reflection meters to measure their Reflection spectra. This method is suitable for the performance evaluation of architectural coatings, roof coatings and other products, helping manufacturers optimize Coatings formulations to meet energy efficiency and environment protection requirements. Implementing this standard will help improve the energy efficiency of coatings and promote the use of green building materials.