This standard provides guidelines for the selection of wood or wood composite substrates suitable for the evaluation of architectural coatings weathering resistance. The standard recommends the selection of representative wood species and surface types to ensure the Reliability and practicality of the test results. Applicable to types of architectural coatings such as exterior coatings, undercoats, wood colorants, etc. Choosing the right wood substrates helps to obtain useful efflorescence data in a shorter time, ensuring the validity and accuracy of the experiment. The standard emphasizes variable control in experimental design and the selection of wood properties.