Abstract: Based on the modular theory ,the size dynamics ,growth pattern and quantitative structure of leaf population of representative genets of Gordonia acuminata were studied. The results were as follows:The natality of leaf population in all genets followed a monomodal curve and it reached its peak value from the end of March to the beginning of April. The pattern of leaf-expanding approximates the “flush-type” suggested by Kikuzawa (1983). The mortality is bimodal shape. The first peak appeared at the beginning of April, which was just a little later than that of the natality’s. The second peak appeared at the end of the growing season. The relationship between the genet’s age and its leaf population size could be well modeled by means of the power function and the Logistic equation. The earlier the new leaves were born, the more slowly their leaf areas and biomass increased. Generally, the area of 2 or 3 years old leaves no longer increased. The maximum area of leaf population appeared from July to August in mature genets, and from August to September in young genets. But the maximum biomass is formed in October in both mature and young genets. This suggests the mature genets reproduce between formation of the maximum leaf area and formation of the maximum number of leaves or biomass.