Abstract: A pot experiment was conducted to study the influences of different NaCl concentrations (0, 50, 100, 200, 400 mmol·L^-1) on the growth, leaf hydrogen peroxide (H₂O₂), malonaldehyde (MDA) content, superoxide dismutases (SOD), catalases (CAT), peroxidase (POD), ascorbate peroxidase (APX) enzymes activity, water potential, soluble sugar and proline contents of Nitraria roborowskii. The results showed that the growth of N. roborowskii was not affected at lower NaCl concentrations (≤50 mmol·L^-1), while the SOD, POD, CAT and APX activities in leaves of N. roborowskii were increased. However, higher NaCl concentrations (＞50 mmol·L^-1) restrained the growth parameters of crown area, number of branches, dry mass of leaf, branch and lateral root, and remarkably reduced the SOD, POD and CAT activities, soluble sugar and proline contents in leaves of N. roborowskii. H₂O₂ and MDA contents in leaves were increased and water potential was reduced with increasing NaCl concentrations.