Abstract: In order to determine the effect of increased nitrogen deposition on photosynthetic characteristics of C. angustifolia, a field experiment was carried out with treatments different in nitrogen supply (0, 5, 10 g/m²) to investigate the effects the photosynthetic pigments and photosynthetic parameters. The response curves of net photosynthetic rate (Pn) versus photosynthetically active radiation (PAR) and intercellular CO₂ concentration (Ci) were measured in situ. The results showed that nitrogen deposition significantly increased nitrogen content, photosynthetic pigment content, Amax and AQE of leaves. However, Rd declined in low N but enhanced in high N, which showed the higher carbon accumulation under high N than low N. Jmax and Vcmax enhanced under nitrogen supply, which could maintain higher photosynthetic capacity under low-temperature.