Abstract: An analysis on ion relation in both soil and plant tissues showed that P. euphratica could exclude salt ions from stem and leaves (leaf Na⁺ and Cl^- contents of high salt treated P. euphratica were only one third of that of the hybrid),selectively absorb K⁺ and Ca²⁺ ions to counter the toxicity of salt ions and maintain membrane integrity (leaf K⁺ contents of P. euphratica were not influenced by and stem Ca²⁺ contents even increased with increase of salt treatments),and store Cl^- ion in root (root Cl^- ion contents of P. euphratica is 30% higher than that of the hybrid) Furthermore,the interception of salt ions in the stem is also of help to alleviate the salt stress for P. euphratica seedlings Because of exclusion of salts in P. euphratica,the soil salt contents are higher for P. euphratica than that for hybrid.