A field experiment was conducted in the winter wheatsummer maize rotation system in low plain of Northern Shandong province to study the effect of supplementary irrigation with slight salt water and straw returned to field on soil salt content dynamic and grain yield.The results indicated that 1~2 times irrigation in wheat growth stage with 2~4 g/L salt content water combined straw returned to field had no significant influence on grain yield and soil salt accumulation.Without straw returning，2 times irrigation with 4 g/L salt water made a significant soil salt accumulation，harmed the wheat growth and decreased the wheat grain yield obviously.After straw returned，the soil plough layer became loose，bulk density improved and soil noncapillary porosity increased significantly.All these could effectively inhibit salt accumulation and make the crop root grow better in soil plough layer.The agricultural strategies of irrigation altering with nonsalt water and slight salt water，straw returned to field and leaching top soil salt with summer rain could make the soil profile salt content get balance yearly.Which ensured the safety and high efficiency of supplementary irrigation with slight salt water.