The effects of organic manure on improving soda saline-alkali soil were studied by field experiments and pot trials.The results showed that applying organic manure to soil could significantly reduce soil pH values.Soil base-exchangeable ion components altered obviously,i.e.,the content of Na⁺ decreased,and the Na⁺ proportion in all cations decreased from 77.91% to 68.56%,while the contents of Ca²⁺ and Mg²⁺ inversely increased due to organic manure application.Meanwhile,the application of organic manure also remarkably increased the contents of soil organic matter（OM）,total N,total P and total K as compared with control.The maize yield increased as amount of organic manure application increased.Our study indicated that the application of organic manure is an important measure to improve the physic-chemical characteristics of soil and increase maize yield.