2 salt resistant oil-sunflower varieties‘YK09’,‘YK31’and 2 salt susceptible varieties‘YK14’,‘YK28’which were screened at the germination stage were treated by salt-alkaline mixed stress which concentra-tion were 75 mmol/L, 150 mmol/L and 225 mmol/L, taking the none-saline and none-alkaline as controlled. Growthindex and water content were measured, and effects of saline alkali stress on the growth and water content of oil sun-flower varieties with different saline-alkali tolerance were analyzed. The results showed that the salt resistant oil-sunflower varieties‘YK09’and‘YK31’grew best at 150 mmol/L concentration, the salt susceptible varieties‘YK14’and‘YK28’thrived at 75mmol/L concentration. The water content of 4 sunflower varieties was the highestat 75mmol/L concentration. 4 sunflower varieties were restrained obviously at 225 mmol/L, the growth, water contentand the root cap ratio decreased.