In order to provide a theoretical basis for the identification and evaluation of oat varieties tolerant to salinity and alkali and to screen out the salinity-tolerant oat varieties suitable for planting in this region,this study indoors with Beile, Courser, Magnum three oats varieties as experimental material, using three NaHCO₃ concentration（25, 50, 75 mmol/L） solution to water the testing material to determine the content of K⁺ and Na⁺ ions in aboveground part by flame photometer. The results showed that the aboveground K⁺ content of seedlings increased first and then decreased with the increase of NaHCO₃ concentration, while the Na⁺ content increased with the increase of NaHCO₃ concentration and the maintenance of a reasonable K⁺/Na⁺ ion ratio were the regulatory mechanism for oat to adapting to salt stress. The sensitivity of three oat varieties to salt stress had differences and ranked from high to low was Magnum、Courser and Beile, and the critical concentration of NaHCO₃ stress in this study was 50 mmol/L.