Abstract:In order to understand the characters of resource allocation and seed germination of figs, the allocation to vegetation and reproduction in figs, and seed germination of four monoecious Ficus species in Xishuangbanna, such as F. benjamina, F. altissima, F. racemosa and F. concinna were studied. The results showed that the allocation of nutrition resources was significantly different among four Ficus species. The heavier fig had more pulp and larger fruit size, and the fig with larger cavity had more seeds, but the number of male flowers and fig wasps were not always like that. The proportions of flowers that fig allocated to male (fig-pollinating wasps) and female (seeds) function were different. The allocation to female function in F. racemosa was more than that to male function, while those in F. benjamina, F. altissima and F. concinna were just the opposite and had different degrees. Besides, there were significant differences in seed size and weight among four Ficus species so that they influenced on seed germination rate and the growth of roots and stems. Ficus racemosa had the largest fig size and most seeds, its seed germination rate also high, but the growth of root and stem was the slowest because of the small-sized seeds. Both F. benjamina and F. altissima had medium-sized figs and large seeds, so they not only had high seed germination rate, but also the growth of roots and stems was fast. The fig size and seed number of F. concinna were small, so its seed germination rate was the lowest among four Ficus species, and the growth of root and stem was the slowest too. Ficus species living in warm, humid and better environment had smaller-sized seeds and relatively worse germination ability and speed compared to those living in barren environment, because of few limits on water, heat, and sunlight. Therefore, these suggested that different Ficus species in different habitats had already evolved variant mechanisms of reproduction allocation and strategies of resource utilization to adapt their environments.