[Objetive] In order to provide the theoretical basis for Astragalus mongholicus introduction, domestication and planting in saline land, the seed germination and seedling growth of A. mongholicus were investigated in different concentrations of NaCl, Na₂SO₄ and NaHCO₃ treatment to understand the effect salt stress on A. mongholicus.[Methods] Seed germination test were conducted in germination box, and the germination rate, germination potential, relative salt injury rate, root length, seedling height and ratio of root and stem of A. mongholicus were measured in different concentrations of NaCl, Na₂SO₄ and NaHCO₃ treatments.[Results] ① A. mongholicus seed germinated normally under the salt stress with the concentration of NaCl<0.2%, Na₂SO₄<0.6% and NaHCO₃<0.3%, and the germination rate and germination potential were all greater than that of control treatment, vice versa. ② The relative salt damage rate of A. mongholicus seed was negative at low concentration (NaCl 0.6%, Na₂SO₄ 0.8%, NaHCO₃ 0.3%) as it promoted the seed germination, while it inhibited the germination of A. mongholicus when the concentration was higher. ③ The stem length, root length and ratio of root and stem of A. mongholicus seedling increased with the increase of salt concentration. When the concentration of NaCl and Na₂SO₄ were 0.4%, 0.6% and 0.6%, 0.3%, respectively, the stem length and root length of A. mongholicus seedling were the maximum. While the stem length and root length of A. mongholicus seedling started to decrease as the concentration of NaCl and Na₂ SO₄ increased. The maximum ratio of root and stem was 1.658, 1.709 and 1.291, respectively, when the concentrations of NaCl, Na₂SO₄ and NaHCO₃ was 0.6%, 0.8% and 0.3% respectively, while it decreased when the concentrations increased.[Conclusion] The seed and seedling of A. mongholicus could germinate and grow normally under salt stress with the concentrations of NaCl<0.6%, Na₂SO₄ <0.8% and NaHCO₃ <0.3%.