The effects of silicon on antioxidant enzymes activities and ion content of rice under the salt stress were studied by the method of K₂SiO₃ foliar spraying.The results showed that the SOD and POD activities were significantly decreased and the MDA content was significantly increased under salt stress.1.0-2.0 mmol L^-1 K₂SiO₃ treatment significantly promoted SOD and POD activities,reduced the MDA content and alleviated the level of membrane lipid oxidation in rice seedlings under the salt stress.Salt stress significantly reduced K⁺,Ca²⁺,Mg²⁺ uptake of shoot and root but increased Na⁺ uptake.1.5-2.5 mmol L^-1 K₂SiO₃ treatment significantly increased the K⁺,Ca²⁺,Mg²⁺ accumulation of shoot and root,but decreased Na⁺ accumulation.1.5 mmol L^-1 was the best concentration of silicon to alleviate the salt injury of rice.In addition,the SiO₂ content of rice stalk was improved after silicon treatment,so the stalk was lodging resistant.