To evaluate the suitability of gravelly sulfate soil as high embankment fill in arid regions with seasonally frozen ground， this study systematically investigated the effects of salt content， moisture content， and fine soil content on the water-salt migration and deformation characteristics of the gravelly sulfate soil through constant-temperature tests and freeze-thaw cycle tests under various conditions. The test results indicate that the increases in salt content （0.5%～0.9%）， moisture content （3.07%～5.07%）， and fine soil content （0.3%～5%） led to reductions in the soil’s freezing temperature by 61.9%， 20.9%， and 4.96%， respectively. The freezing temperatures of the tested soil samples ranged from -1.15 to -0.67 ℃. With the increase of soluble salt content， the freezing temperature gradually decreased， which could promote the migration of water and salt to the cold end. When the salt content of the sample was the same， increasing the fine soil content from 0.3% to 5% resulted in a 62.8% increase in maximum deformation. Higher fine soil content and salt content were found to facilitate a shift in deformation behavior from settlement to heave. The total deformation of the sample with 3% fine soil content was small， and the distribution of water and salt was close to the initial value， indicating relatively stable. It is suggested that the fine soil content controlled by the gravel sulfate soil high fill embankment in this area should not exceed 3%.