Abstract: The comparison of biochemical response between P. euphratica and P. popularis showed that plasmmnan of P. euphratica could tolerate high salt stress of 200 mM NaCl The membrane permeability of P. euphratica did not increase significantly by day 3 after salt treatment,while that of hybrid increased with the increase of salt treatments The factors related to the high membrane stability in P. euphratica might be:(1)SOD activity increased with increasing salt treatments;(2)the synthesis of compatible osmotic solutes such as polyamine and proline was sensitive to salt stress In addition,the new bands proteins appeared under high salt stress,which was also an indicator of salt tolerance for P. euphratica.