Abstract: To make known the salt tolerance and suitable ecological regions of Glycyrrhiza inflata, Glycyrrhiza uralensis and Glycyrrhiza glabra from Xinjiang, the seeds of three species were salt stress treated using Na₂SO₄, NaCl and NaHCO₃ at different concentrations to compare their germination responses, salt tolerance and suitable ecological regions. The germination percentage, mean germination days, germination energy, length of plumular axis, germination recovery percentage of three medicinal licorices were recorded. Germination percentage, relative vigor index and length of plumular axis of three species obviously declined with increased salinity. Germinate time prolonged under high salinity stress. The sequence of salt injury level of seed was NaHCO₃>Na₂SO₄>NaCl. There was a significant difference of salt tolerance threshold among three species. G. inflata exhibited greater germination ability under salt stress than G. uralensis and G. glabra. So it is suitable planted in the soil mainly with chloride-sulfate containing 0-1.3% salt. The NaHCO₃ tolerance of G. glabra was the highest and can be planted in the abandoned saline land containing NaHCO₃. The slat tolerance of G. uralensis was the weakest. Therefore, the optimum salt concentration for G. uralensis was 0-0.7%.