Abstract:The experiments were conducted to investigate the effect of ecological factors, such as treatment solutions and temperature on the salt tolerance of the Puccinellia tenuiflora seeds. The relative germination ratio were used as a measurement for its salt-tolerance. The experiments includs 2 treatment temperatures, 3 seedlots and 4 solutions (PEG, NaC, CaCl2 and NaSO4) with the different osmotic potentials or concentrations. Relative germination was linearly decreased as the osmotic potential of the solutions decreased, and the regression coefficient and intercept of regression equation reflected magnitude of osmotic and ionic effect of the solution on germination, respectively. No evident difference of the relative germination in salt solutions exited among the seedlots with significantly different germination in water. Solution types and ambient temperature during germination affected salt-tolerance of seeds through modifying ionic effect of solutions, but they caused no alteration of osmotic effect of the solutions on germination. The osmotic effect of the four solutions on germination of Puccinellia tenuiflora was a decrease of the relative germination rate by 52.3 % with a 1.0 mpa decrease of osmotic potential. The increase of the seed germination rates by treatment of the 3 osmatic potential salt solution were 14. 0%, 15. 1% and 21. 6% in comparison with that of PEG, under a temperature of 10～25℃. The ionic effect of NaCl solution was 17.0% lower under 15～25℃ than that under 10～25℃