In order to explore the effect of organic silicon compound fertilizer on the amelioration of moderate coastal saline soil on the west coast of Bohai bay，using maize as material，field plot experiment was carried out in Haixing experimental station of Chinese Academy of Sciences in Haixing county，Cangzhou city，Hebei province.Five treatments were set up，including C1(600 kg·hm-2 diammonium)，C2(375 kg·hm-2 organic silicon compound fertilizer)，C3(750 kg·hm-2 organic silicon compound fertilizer)，C4(1125 kg·hm-2 organic silicon compound fertilizer)and CK(no fertilizer).The effects of organic silicon compound fertilizer on water and salt transport in coastal saline-alkali soil and the correlation between soil physical and chemical characteristics and corn yield were analyzed by measuring soil physical and chemical characteristics and corn yield in 0～40 cm soil layer at different growth stages.The results showed that with the increase of application amount of silicone compound fertilizer，soil moisture content，aboveground dry weight，grain number per spike and yield increased，soil pH value，soil salt，Na+ and Cl- contents were decreased，and the underground dry weight reached the maximum at C3 treatment.In different growth stages and different soil layers，the application amount of organic silicon compound fertilizer had different effects on water and salt migration.The difference in the upper soil(0～20 cm)was greater than that in the lower soil(20～40 cm)，and the effect on the early growth stage was greater than that on the late growth stage.The improvement and yield increase effects of different treatments on coastal moderately saline soil were ranked as C4>C3>C2>C1.There was a significant negative correlation between maize yield and soil pH value，water-soluble salt content，Na+and Cl- contents，and there was a positive correlation with soil water content.In different soil layers and different growth stages，the correlation degree was different.The correlation coefficient of upper soil(0～20 cm)was generally higher than that of lower soil(20～40 cm)，and reached the maximum at seedling stage.The correlation with water soluble salt content was the strongest.These results provide theoretical basis and technical support for improving and increasing yield of moderately saline soil in the west coast of Bohai bay.