Rice backcross import line JE,JI1,JI2,JH1,JH2 and its backcross parent JJ （Jijing 88） were selected forhydroponics in greenhouse.50 mmol/L Na₂CO₃and Na HCO₃（molar ratio 9∶1） were used as saline-alkali treatment.Mineral elements of Na⁺,K⁺,Ca²⁺,Mg²⁺,Fe²⁺,Zn²⁺,Mn²⁺,Mo²⁺contents were measured to study the effect on riceseedllings.Result showed that the Na⁺content in rice seedling was positively increased under saline-alkali stress.Alot of Na⁺was distributed to the leaves and the high concentration of cation in the plant tissue disturbed the ion ho-meostasis.The K⁺contents in rice seedling was decreased under saline-alkali stress,while the K⁺content in leavesdecreased less than that in roots.The distribution ratio of K⁺in the leaf increased,thus maintaining a higher K⁺/Na⁺ratio,so that the plant was less affected by saline-alkali stress.The content of Ca²⁺and Mo²⁺in leaves decreased,while the content in roots increased.The Mg²⁺content did not changed significantly.The Mn²⁺content in rice seed-ling decreased,especially in roots.The content of Fe²⁺and Zn²⁺showed an increasing trend.Compared with JJ,theK⁺/Na⁺,Ca²⁺/Na⁺,Mg²⁺/Na⁺ratio in leaves of the salt-tolerant varieties （JE,JH1,JH2,JI1,JI2） are higher,and thepercentage of the Na⁺contents of total cation and monovalent cation was lower.