Abstract: The reproductive allocation (RA) of G. acuminata in different community types of subtropical evergreen broad-leaved forest of Jinyun Mountain was investigated. We analyzed the reproduction of the plant population as its adaptive strategies. Reproductive allocation in G. acuminata and its environmental adaptation were analyzed using gray rational degree and gray dynamic model. The results showed that the reproductive allocation in G. acuminata varied among age and community types. It was largest in pure forest of G. acurninata, intermediate in evergreen needle and broad-leaved forest, and smallest in evergreen broad-leaved forest. The gray rational analysis revealed that the soil pH, the average air temprature, the organic matter content of soil and soil moisture played an important role in formation of reproductive allocation of G. acuminata. The gray rational time dynamic model for interaction between reproductive allocation and environmental factors was expressed as:dy/dt+0.42y＝0.07x1–4.26x2–6.38x3+15.54x4–7.46x5+4.72x6+1.97x7–0.66x8+0.57x9–0.20x10