Abstract: The purpose of this study was to determine the effects of applying saline-alkali soil amendments on saline-alkali soils and on silage maize growth in different seasons (Spring or Autumn) in the river irrigation region, analysis the changes of pH, EC and alkalinity in the soils (0-20 cm). The field experiment using silage maize (Zea mays L. cv. Ruide 2) as trial crop was conducted to investigate the effects of applying Desulfurized gypsum, Guo-chan DS, and Desulfurized gypsum + Guo-chan DS in spring and autumn on the emergence rate and fresh yield in the severe soda saline-alkali soil. The results showed that, after application of soil amendments, the emergence rate of silage maize was increased by 6.8%-72.7%, fresh yield of silage maize was increased by 1223.2-28144.8 kg/hm2, soil pH reduced 0.09-0.83, EC value enhanced 0.13-1.26 mS/cm and alkalinity declined 1.6%-19.8% compared to the control. The emergence rate and fresh yield of silage maize was significantly increased after application of Desulfurized gypsum, and Desulfurized gypsum + Guo-chan DS in both autumn and spring. Application soil amendments in autumn had better effect of improving saline-alkali soils than in spring. The application in autumn of Desulfurized gypsum + Guo-chan DS had the best effect of improving saline-alkali soils among three soil amendments.