Abstract: In order to reveal the essence of soil water,heat and salt transport process in non-growth period of salinization irrigation area,and explore the most suitable agricultural sustainable development model and optimal allocation strategy of water resources in irrigation area,two complete non-growth period field positioning experiments were carried out in typical moderate saline-alkali land in Hetao irrigation area from 2019 to 2021,aiming to lay a foundation for accurately evaluating the characteristics of soil water,heat and salt coupling transport in non-growth period salinization irrigation area.The results showed that the soil heat in the non-growth period was generally transmitted from the deep layer to the surface layer,which was mainly in the pre-freezing period and the freezing period,while the ablation period was in the opposite direction.Autumn irrigation and water phase transition are the key factors driving water and salt migration:soil freezing promotes about 60%~80% of water and 15%~20% of salt to move to the deep layer,while the ablation stage transports 130.77%~168.43% of water to the shallow layer and increases 21.11%~24.01% of salt.The desalination effect brought by autumn irrigation before freezing is short,especially in the shallow layer,it is even difficult to maintain until the freezing period.Therefore,moderately delaying autumn irrigation is more conducive to water saving and salt control.With the advance of non-growth period,the influence depth of air temperature on soil temperature and water on salt gradually weakened,and the interaction effect decreased.The correlation between soil temperature and salinity is enhanced,and the effect of soil temperature on water content during freezing period is particularly significant.