[Objective] The effects of drainage ditch on the distribution of soil salinity in saline soil were studied, and the effects of water and salt reduction in clear gully drainage were clarified to provide theoretical basis for improving the economic benefits and ecological protection of jujube and the long-term improvement measures of saline soil.[Methods] The effects of drainage on the salinization of salinized jujube soil were studied. The soil samples of salinized jujube fields were sampled. The contents of water soluble salt, electric conductivity, pH value and equivalent proportion of salt base cation were measured.[Results] The content of salt ions decreased first and then increased with the increase of the distance from the ditch. The content of salt ions was the highest at 0 m, and then decreased with the increase of distance, reached the lowest at 40 m, the content of salt ions increased significantly after 40 m. In addition, from the ditch of 40 m, wherein soil salt damage shifted and decreased from NaCl cation type of severe degree into CaCl₂ and Na₂SO₄ caused mild degree.[Conclusion] The best effect of ditch drainage salt reduction was observed around 40 m from the ditch. Impacted by drip irrigation and ion transport rate and other factors, salt ion aggregation phenomenon emerged in the soil surface and at the bottom as well.