Abstract: In order to explore the response strategies of plateau wetland plants to increasing temperature and CO₂ concentration, Typha orientalis, a common emergent plant in plateau areas, was selected as the research object to detect its leaf functional traits, and the simulated climatic change of increasing 2 ℃ temperature and CO₂ concentration doubling were designed by constructing a capping artificial growth chamber. The results showed that:（1）The net photosynthetic rate, stomatal conductance, intercellular CO₂ molar fraction and transpiration rate of T. orientalis under the CO₂ concentration doubling treatment were significantly reduced（P＜0.05）; while the net photosynthetic rate and stomatal conductance of T. orientalis were also significantly reduced under the warming treatment（P＜0.05） compared with the control group. The results indicated that the photosynthetic carbon assimilation capacity of T. orientalis was significantly reduced under the temperature increasing and CO₂ concentration doubling conditions（P＜0.05）.（2）The vein density of T. orientalis leaves increased significantly under the CO₂ concentration doubling treatment; while the vein density and stomatal density increased significantly, but the vascular bundle area and catheter area decreased significantly（P＜0.05） under the warming treatment compared with the control group. The results reflected the enhancement of water transport and transpiration loss capacity but the reducing of water use efficiency of T. orientalis under the conditions of warming and CO₂ concentration increasing.（3）The correlations among leaf photosynthetic parameters were looser, while the correlations between net photosynthetic rate and leaf structure traits were stronger under warming and CO₂ concentration doubling treatments than control group. The results showed that the functional synergistic or trade-off effects of leaf functional traits of T. orientalis were enhanced significantly by increasing temperature and CO₂ concentration.