[Objective] The purpose was to discuss drought resistance mechanism of Chenopodium album L.and supply theoretical basis and practical guidance for artificial cultivation and popularization of C.album.[Method] C.album seedlings grown to 6th leaf stage were conducted osmotic stress treatment with PEG6000 osmotic whose concentration was set up as 0,5%,10% and 20% and the various physiological indices of the 3rd-5th function leaves in upper plant were determined after being treated for 0,1,3,5,7 and 9 d.[Result] Under osmotic stress with 5% PGE,the relative water content(RWC)of C.album reduced less.Under osmotic stress with 10%,the RWC in seedling leaves of C.album decreased to 62% on the fifth day and the leaves began to wither.Under osmotic stress with 20%,the RWC in seedling leaves of C.album decreased to 61.9% on the third day and the leaves appeared withering,and the RWC decreased to 48.6% on the 7th day and the leaves were dry and yellow.Proline contents in seedling leaves of C.album under osmotic stress with 5%,10% and 20% PEG were 7.64,10.9 and 29.4 times of CK on the 7th day.[Conclusion] C.album had some adaptability to moderate osmotic stress,but the PEG osmotic stress with high concentration and long time might lead to severe damage on C.album.
