Abstract: The“applying fertilizer”effects of C0₂ enrichment on Aneurolepidium chinense are analyzed by using artificial simulation experiment．The results show that when the biomass is increased by above 20％ ．the photosynthesis rate is increased by about 50％ ，at the same time，stoma resistance enhanced，transpiration rate decreased and water use efficient heightened．The impacts of soil drought stress on Aneurolepidium chinense are negative，it is just opposite compared with C0₂ enrichment．The soil drought stress restrains the“applying fertilizer”effect on some degree under high CO₂ concentration．