Abstract: To grasp the physiological differences of salt tolerance of five Nitraria species, with different concentrations of sodium salt medium and Nitraria seeds as experimental materials, by means of seed disinfection, soaking in warm water for 24-48 h to absorb water, and cultivation in incubator, we studied the influence of different concentrations of NaCL on seed germination of five Nitraria species. The results showed that different concentrations of sodium salt had different effects on the absolute germination rate, relative germination rate and germination index of Nitraria seeds. Among them, sodium salt concentration of 0-10 g/L gradually increased the absolute germination percentage and relative germination percentage of Nitraria species, except N. sibirica; while sodium salt concentration of 10-25 g/L gradually decreased the absolute germination rate and relative germination rate of the five Nitraria species; sodium salt concentration of 0-5 g/L increased the seed germination index of all the tested species, while sodium salt concentration of 5-10 g/L increased the germination index of N. schoberi and N. tangutorum, but decreased that of N. sibirica, N. roborowskii, N. sphaeroearpa, showing that the salt tolerance of N. schoberi and N. tangutorum was strong. The research results could provide a scientific basis for the improvement of saline-alkali soil and the restoration of damaged ecosystems in arid areas of China.