Abstract: 【Objective】 To study the salt tolerance of newly introduced forage varieties, the range of salt tolerance concentration, and screen out the varieties with strong salt tolerance, which is very important to improve salinized soil and land efficiency. 【Methods】 The new varieties of forage rape, sweet sorghum and alfalfa were taken as the research objects, different concentrations of NaCl solution (0%,0.4%,0.8%,1.2%,1.6%)were used for stress treatment to determine the germination rate, germination potential, relative salt damage rate,salt damage rate of germination potential and germination index within 7 days. 【Result】 Compared with the control 0% treatment,when the concentration of NaCl was 0-0.4%, there was no significant difference in germination rate and germination potential among the three forages. Sweet sorghum was more sensitive to low salt stress, when the concentration of NaCl was 0.4%, the relative salt damage rate was 53.41%, and the germination index was 28; When the concentration of NaCl was 0.8%, the germination rate of alfalfa was the highest, which was 96.67%. The germination rate of forage rape was 93.33%. The germination rate of forage sweet sorghum was the lowest, which was 75.33%. Otherwise, the salt damage rate of germination potential was the highest, which was 18.57%. The inhibition of salt stress was obvious, the germination index was the lowest (20.89); When the concentration of NaCl was 1.2%, the germination rate of forage rape was the highest, which was 83.33% and the relative salt damage rate was 100%. The relative salt damage rates of sweet sorghum and alfalfa were 93.4% and 67.68% respectively. When the concentration of NaCl was 1.6%, the germination rate of alfalfa was the highest (74.67%), and the salt damage rate was the lowest (81.61%). 【Conclusion】 In general, forage sweet sorghum is sensitive to low salt stress. The germination of feed rape is obviously inhibited under medium and high concentration salt stress. Alfalfa has the strongest tolerance to salt stress, and maintained the highest germination rate and germination potential under high salt stress. The tolerance order of the three forages to NaCl stress is alfalfa > forage rape > forage sweet sorghum.