The GB/T 23981.2-2023 standard aims to provide a method for the determination of hiding power of coatings, which is mainly evaluated by the black and white check board method. This standard is a revised version of GB/T 1726, which provides guidance for the determination of hiding power of white or light Paints. The revised standard promotes the trade and technical development of coating products by optimizing the instrumentation, material requirements and operation steps to enhance the comprehensibility and operability of the technical content. The standard defines the key terms of hiding power and Paints in detail, specifying the necessary test equipment, such as soft-bristled paint brushes, Glass plates and Checkerboard Glass plates, etc., to ensure the accuracy and Repeatability of the test. Through the two test methods of A (brushing method) and B (lame plating method), the standard covers the steps of sample preparation, painting, observation and measurement, which provides guidance for accurately evaluating the hiding power of coatings and helps to improve the mass and competitiveness of paint products.