[Objective] The dynamic variations in salt ions in coastal saline soil and the differences in maize growth indicators after the addition of different amendments were analyzed in order to provide scientific basis for the further refinement of management measures for desalination and amelioration of coastal saline soil. [Methods] A field-controlled experiment was conducted in the Dafeng coastal reclamation area of Yancheng City,with maize（Liyu 88） as the aboveground crop.A total of ten treatments were set up:control （CK）,and compound fertilizer combined with low ①,medium ②,and high ③ levels of biochar （BC₁-BC₃）,desulfurized gypsum （DG₁-DG₃）,and chicken manure （CM₁-CM₃）.The response characteristics of the physicochemical properties and salt ions of coastal saline soil,as well as maize growth,were analyzed. [Results] ① All amendments improved the soil physicochemical properties,salt ion contents,and ion composition to some extent.However,the addition of desulfurized gypsum was more effective in improving the core physicochemical properties of coastal saline soil,significantly reducing soil pH value and electrical conductivity （EC）.The medium level of desulfurized gypsum（DG₂） was most effective in ameliorating soil salt ions,significantly reducing the contents of Na⁺ and Cl^- and the sodium adsorption ratio （SAR）.Additionally,this treatment promoted the accumulation of K⁺,Ca²⁺,Mg²⁺,and SO₄^2-,but had little influence on NO₃^-.② The promoting effect of maize growth by desulfurized gypsum addition was superior to that of biochar and chicken manure.Notably,the medium level of desulfurized gypsum （DG₂） treatment resulted in the highest maize yield among all treatments over the two years,reaching 2.337 t/hm² and 2.190 t/hm²,respectively. [Conclusion] Among the different amendment levels tested,the medium-level addition of desulfurization gypsum （5 t/hm²）(DG₂) is the most effective for enhancing soil desalination and increasing maize yield in coastal saline soil,and can be prioritized for the soil amelioration.