The experiments were performed to investigate the effects of exogenous SA on the physiological parameters in Chinese cabbage under NaCl stress.Chinese cabbage seedlings were treated by foliar spray of 0, 0.1, 0.5, 1.0, 1.5 mmol/L SA, and were then subjected to NaCl stress.Results indicated that 0.5 mmol/L SA significantly improved the plant height, plant dry weight, root thickness, leaf area and significantly reduced the leaf malondialdehyde (MDA) content and electrolyte leakage rate, significantly enhanced superoxide dismutase (SOD), peroxidase (POD), catalase (CAT) and other plant cell protective enzyme activity of leaf.Appropriate concentration of exogenous SA could reduce the stress on the cabbage injuries by increasing plant osmotic adjustment ability, antioxidant capacity and protecting the membrane structure.The best treatment concentration of SA was 0.5 mmol/L.