Abstract: Taking the biennial Cinnamomum camphora seedlings as experimental materials， treated with 0， 50，100 and 200 mmol·L-1 NaCl or Na2SO4， soluble sugar content，antioxidant enzyme system and photosynthesis in the seedlings of Cinnamomum camphora during autumn were studied. The results showed that photosynthetic pigments content， SOD activity， POD activity and the value of chlorophyll a/b increased firstly， then decreased. Photosynthetic rate， stomatal conductance， transpiration rate， CO2 intercellular concentration reduced， while soluble sugar content， MDA content and plant tissue conductivity increased with the increased concentration of NaCl. With the increased concentration of Na2SO4， photosynthetic pigments content， SOD activity， POD activity and the value of chlorophyll a/b firstly increased and then decreased. The photosynthetic rate， stomatal conductance and transpiration rate showed a downward trend， and CO2 intercellular concentration， soluble sugar content， MDA content and plant tissue conductivity increased. Cinnamomum camphora seedlings had a certain degree of tolerance under low concentration of salt stress， and the effect of NaCl stress on Cinnamomum camphora seedlings was higher than that of Na2SO4.

Key words: salt stress, Cinnamomum camphora, antioxidant enzyme system, photosynthetic characteristic