The ASTM D 2805-11 (2023) Standard Test Method for Determining Coating hiding power with a reflection meter is an important technical specification developed by the American Society for Testing and Materials (ASTM) for the evaluation of Coating hiding power. The standard clarifies the test principle, equipment requirements, test procedures and data calculation methods for measuring Coating hiding power using a reflection meter. Hiding power is an important performance indicator of Coatings, which directly affects its ability to cover substrate Color and surface characteristics. This method provides a fast and accurate means through reflection measurement technology, which is suitable for various types of Coatings. This standard provides a scientific basis for Coating manufacturers, testing laboratories and mass management departments, which helps to improve the accuracy and conformity of product performance evaluation and promote the development of industry standardization.