Photosynthesis and leaf traits of Incarvillea zhongdianensis grown in different growth irradiances were investigated in ShangriLa and Kunming. The results showed that the photosyhthetic rate（Pn）, content of carotenoids（Car）, ratio of chlorophyll a to b（Chla/b）in Izhongdianensis decreased with the decreasing irradiance in ShangriLa, while specific leaf area（SLA）, chlorophyll b（Chlb）, leaf nitrogen content per unit area（LNCa）increased. The photosynthetic acclimation of Izhongdianensis to growth irradiance was mainly dependent on the adjustment of leaf anatomy, biochemical efficiency and leaf nitrogen partitioning into different photosynthetic components. This species showed a large plasticity in photosynthetic response to light intensity, which was contributive to its introduction and domestication. Izhongdianensis had wide adaption for irradiance in ShangriLa, after transplanted to Kunming, Pn decreased about 10%, but relative growth rate （RGR）increased 30%, which indicated that it could grow well under the irradiance condition of Kunming.