In order to reveal the spatio-temporal characteristics of soil salinity in the Wulate irrigationarea，and to clarify thedominant factors affecting soilsalinization，principal component analysis and Kriging interpolation were used to analyze theseasonal variation characteristics and spatial distribution ofpH，total salt content and saline ions in the 0～ 40 cm soillayer.The results showed that the soil in the study area was mainly mildly to moderately salinizedsoil.The average total salt contentof the soil inspring，summer and autumn was more than 2g/kg，which belongs to moderately salinesoil；the total salt contentof 0～ 20 cm soil layer was 0.807 g/kg higher than that of 20～ 40 cm soillayer，indicating 0～ 20 cm soil layer was anaccumulation layer ofsalt.The soil cations were mainly K ++Na+，and the anions were mainly SO 42-and Cl-.The saline ionsin each layer showed as in spring>autumn>summer；the variation coefficients of cations Mg 2+，K ++Na+ and Ca2+ were between 99.73% and191.20%，with strongvariability；the variation coefficients of anions SO 42-and Cl-were between 116.75%and193.78%，showing a greatly strong variability；the variation coefficients of HCO 3-in spring，summer and autumn werebetween 10% and100%，which was a medium variability.Principal component analysis showed that total salt content、 Cl-、SO42-、Mg2+、Ca2+、K++Na+ had a large factor loading on the first principal component and were closely related tosoil salinization；pH and HCO 3-were in the second principal component relative to other factors，and the load was higher，indicating that the second principal component mainly affected the alkalinity of the soil，that characterizes the alkalinity ofthesoil.0～ 40 cm soil layer non -salinized soil accounted for about 0.1% of the studyarea；the area of mildly to moderatelysaline soil was the largest inspring，summer andautumn，accounting for more than 75% of the totalarea.There were a smallamount of mildly saline soil in the eastern part of the study area in April andOctober，and that inOctober(341.1 km 2)wasgreater than in April(147.8 km 2)，and the area of mildly saline soil in July was 761.3 km 2.Therefore，determining the dominant factors of soil salinization and their temporal and spatial distribution characteristics can provide a theoretical basis for soil salinization management and sustainable use of land resources in the Wulate irrigation area.