Abstract:The seed dormant characteristics of Polygonatum sibiricum Red. were studied in the aspects of seed morphology, anatomical structure, bioassay of some inhibitors in fruits and seeds, and the changes of endogenous hormones ABA content during seed ripening as well. The results showed that the seed dormancy was comprehensive. First, physiological past-ripening was the main reason for seed dormancy after autumn harvesting; Second, the symplast transportation was limited because of endosperm cell with small size, thick cytoplasm, close arrangement with tiny intercellular space; Third, germination inhibitors existed in fruits and seeds; Finally, the increase of ABA content at maturity also caused the seed dormancy.