With four true leaves of Daphne giraldii Nitsche as the material, we investigated the effects of various NaCl stress（50,100,150 and 200 mmol·L^-1）on photosynthetic physiological indexes as seedling photosynthetic pigment content, chlorophyll fluorescence parameters and gas exchange parameters of D. giraldii Nitsche. based on the pots experiments in sand culture systematically. The result showed that: (1) Under a proper environmental condition(Control), the daily variation of P_n and G_s are both illustrated by doublepeak curve while the daily variation of T_r is represented by a single peak one, thus the daily variation of D. giraldii Nitsche.’s leaves is changed by a higherconcentrated NaCl stress(>100 mmol·L^-1) that causes an overall decline to the daily variation curves of P_n, T_r, as well as G_s, and an overall rise of C_i’s daily variation curve; (2) A lowerconcentrated NaCl stress（50 mmol·L^-1） has little effects on the leaf chlorophyll content and the ratio of D. giraldii Nitsche and its chlorophyll content declined significantly by a higherconcentrated NaCl stress（>100 mmol·L^-1）when the ratio had a slight decrease. (3)F_m,F_v/F_m, F_v′／ F_m′, qP, Φ_PSⅡare all declined significantly by a higherconcentrated NaCl stress（>100 mmol·L^-1）, while F₀ and NPQ are both raised significantly. The research shows that with the increasing of NaCl concentration, the reason for leading to the decrease of photosynthetic rate was mainly caused by the nostomatal factors; D. giraldii Nitsche is fairly resistible of less NaCl stress but a worse NaCl stress may damage the activity of photosynthetic apparatus, thereby surging photoinhibition and restricting photosynthesis.