The experiment was carried out by taking a natural halophyte Kochia sieversiana as the material and using simulative ecological conditions.The seedlings of K.Sieversiana were treated with mixture of two neutral salts（NaCl and Na₂SO₄） and two alkali salts（NaHCO₃ and Na₂CO₃） in various proportions.The treatments included a salt concentration range of 80 to 400 mmol·L^-1 and pH values from 6.93 to 10.68.The water content and other physiological indices of stressed seedlings were determined and analyzed.Effects of salt-alkaline mixed stress on growth of K.Sieversiana were explored and the effect factors of stress analyzed.