Abstract: Gynostemma penaphyllumis a dioecious species with male-biased sex ratio in natural condition. In this paper ,the authors examined foraging behavior and reproductive stategies in the species in the same habitat based on the methods of comparative ecology. The preliminary results and conclusions are shown as follows:the ratio of biomass allocation to main branch in the male population is obviosly more than that in the female population,which implies the vegetative reproduction in the raios of biomass allocation other parts female and male popupation enhance greatly. In contrast, there are not much different in the raios of biomass alocation to other parts between the populations.

Key words: Gynostemma pentaphyllum, Female and male population, Foraging behavior, Reproductive strategies, Male-biased of sex ratio