为提高厚朴造林质量，开展了苗木地径、亩高与厚朴幼树生长关系的研究，结果表明：厚朴苗木高度对幼树生长无明显的影响，苗木过高反而会降低造林成活率；苗木地径大于0．9cm时，地径对幼树生长也无显著的影响。因此，厚朴苗木不宜以苗高为分级依据。厚朴苗木的适宜高度可从便于起苗、运输、栽种等生产环节来确定。厚朴苗木地径的分级，优质苗的下限也不应大于0.9cm。 In order to improve the quality of Magnolia officinalis plantation, the study on the relationship between seedling diameter, seedling height and the growth of Magnolia bark was carried out. The results showed that the height of Magnolia bark had no significant effect on the growth of young seedlings. However, When the diameter is more than 0.9cm, the diameter has no significant effect on the sapling growth. Therefore, Magnolia seedlings should not be based on the classification of high seedlings. The suitable height of Magnolia seedlings can be determined from the aspects of production, transportation, planting and other convenient steps. Magnolia seedlings diameter grading, the minimum high-quality seedlings should not be greater than 0.9cm.