There are usually two types of indicators used to describe the quality of seedlings, one is the morphological or physical measurement of the seedlings, and the other is the measurement of the physiological or intrinsic quality of the seedlings. Since the 1980s, research on seedling quality in various countries has gradually transitioned from a single morphological quality indicator to a field where morphological indicators and physiological indicators are combined, and extended to the molecular level. The quality evaluation of seedlings also extends from the seedling process to the entire process including seedling emergence, storage, transportation, planting, and early growth after planting. Because the measurement results of the physiological quality of seedlings are not intuitive, the results of some methods are unstable, some methods are destructive, and require specialized equipment and technology, they are only suitable for research and not suitable for production applications. Therefore, through research to find the correlation between various physiological indicators and morphological indicators, determine the main and auxiliary morphological indicators of each tree species and each seedling age type that best represent the quality of seedlings in each region, as well as the physiological indicators that are convenient for measurement and application. based on actual production, it is an important task of seedling quality evaluation research.