Abstract:The physiological characteristics of salt resistance in Iris lactea var.chinensis was studied by using solution culture. The results showed that NaCl stress made ChlorophyⅡ content, dry weight and plant height decreased in I.lactea var.chinensis. NaCl stress increased production rate of active oxygen and permeability of plasma membrane as a result,MDA contents and relative electrolytic leakage increased. With the time of salt stress and salt density increased, the growth of I.lactea var.chinensis has been seriously affected. Adjusting osmotic substance such as proline and soluble protein has the much more impact on salt resistance in I.lactea var.chinensis.