Neutral salt（NaCl and Na₂SO₄） and alkaline salt（NaHCO₃ and Na₂CO₃） was mixed in various proportion and treated to Kochia sieversiana as single salt stress.RGR and other indexes were determined.Then characteristics of four single salt and difference among them were analyzed by comparative physiology responses of Kochia sieversiana under single salt stress.The result indicated that the highest tolerance degree of Kochia sieversiana to four common salt stress were different,they are NaCl（1000 mmol· L^-1）,Na₂SO₄（800 mmol· L^-1）,NaHCO₃（600 mmol· L^-1）,Na₂CO₃（175mmol· L^-1）,respectively.