In order to explore the law of soil salinity and ion migration and aggregation under different irrigation and drainage modes in salinized irrigated area,From May to October 2021,soil water and salt monitoring and irrigation and drainage water monitoring were carried out in farmland under the modes of "drip irrigation+open ditch drainage" and "flood irrigation+dark pipe drainage" in the saline-alkali cultivated land improvement demonstration area in Wuyuan County,Bayannaoer City.To analyzed the migration and distribution of soil salt under different irrigation and drainage modes,and to explore the characteristics of soil salt and salt ion accumulation and desalting by equilibrium analysis,so as to provide scientific basis for water-saving planning and salinization prevention and control in irrigated areas.The results showed that the farmland soil was in a state of desalination under different irrigation and drainage modes,and the soil desalting effect was relatively good under "flood irrigation+dark pipe drainage" mode,the desalting rate is 37.73%.HCO₃^- was in a state of accumulation under "drip irrigation+open ditch drainage" mode,and the accumulation was 0.3 t.The accumulation of Ca²⁺ and Mg²⁺ occurred under "flood irrigation+dark pipe drainage" mode,the accumulated amount is 2.962 4 t and 0.577 4 t,respectively.During the whole growth period under "drip irrigation+open ditch drainage" mode,the 0—40 cm soil layer was in a state of desalinization,and the 40—80 cm soil layer appeared salt accumulation.Under "flood irrigation+dark pipe drainage" mode,the 0—100 cm soil layer was in desalinization during the entire growth period.The groundwater depth was the same under different irrigation and drainage modes.The groundwater depth was lower under "flood irrigation+dark pipe drainage" mode.The soil salt accumulation and groundwater quality were negatively correlated under "drip irrigation+open ditch drainage" mode,only HCO₃^- in soil was positively correlated with each ion of groundwater,and HCO₃^- in soil was strongly correlated with Mg²⁺ and HCO₃^- in groundwater,and the correlation coefficients were 0.833,0.759,respectvely.The overall correlation between soil salinity and groundwater quality was not obvious under "flood irrigation+dark pipe drainage" mode.