Abstract: Effects of salicylic acid on salt stress-induced injuries were investigated during the stage of seed germination and seedling growth of cauliflower (Brassica oleracea var. botrytis). Under the stress, presoaking the seeds with 0.5-1.5 mmol/L of salicylic acid increased the germination percentage, germination energy, germination index and relative α-amylase activity of cauliflower. Among the treatment of salicylic acid, 1.0 mmol/L had the best effect. The results also showed that treatment with 0.5-1.5 mmol/L of salicylic acid during the stage of seedling growth under salt stress increased the plant height, stem diameter, leaf area, chlorophyll contents, free proline and water dissolved-carbohydrate contents, the activities of superoxide dismutase (SOD) and peroxidase (POD), and decreased the content of malondialdehyde (MDA), suggesting that the exogenous SA (salicylic acid) could effectively mitigate the injuries of salt stress and increase salt-tolerance of cauliflower seeds and seedlings by increasing α-amylase activity, osmotic regulation and antioxidation. The best treatment concentration of salicylic acid was 1.0 mmol/L. When the concentration of SA was beyond 2.0 mmol/L, no mitigation effect was observed on the seeds germination and growth of seedling under salt stress.