Abstract: This paper investigated the growth and photosynthesis of three Fraxinus species under various NaCl concentrations.The results indicated that,with NaCl concentrations increased,(1)The seedling biomass and chlorophyll contents of leaves decreased;(2)The MDA contents of leaves did not vary obviously;(3) The net photosynthetic rates(Pn),stomatal conductance and transpiration rates decreased,while vapor pressure deficit based on leaf temperature increased,the inter cellular CO 2 concentrations increased or decreased.The pearson correlations between NaCl and inter cellular CO 2 concentrations are different.