Abstract: The dry matter accumulation in the organs of a sesame hybrid,cross 8809, and its parents was observed during their growth period in this study,Their Logistic growth equations were simulated with a micro-computer,The dynamic analysis of the heterosis of all organs vras performed by three indexes i,e, the top weight, the average growth rate and the top growth rate, The result showed that growth curves of all organs of the hybrid and the parents were of a +S" shape，and the turning points of the growth curves for the organs except the stem and roots of the hybrid distributed between those of the2 parents, All these three indexes of the hybrid were superior to those of its parents, and the superiority of the whole-plant growth and the vegetative growth was even stronger than that of the reproductive growth,53 to 64 days after emergence of seeds, the reproductive growth rate of the hybrid was significantly higher than those of the parents, and this period was the most important period for the reproductive growth of the hybrid.

Key words: Sesames , Heterosis, Logistic equation