In order to reveal the regularity of salinity degree and nutrient change of soil in saline-alkali land after planting feed rapeseed,an experiment was carried out in saline-alkali land in Yingxian,Shanxi Province.The effects of feed rapeseed on soil saline-alkali degree,soil nutrients and mineral elements contents in different saline-alkali soils were studied under the same conditions. Soil samples were collected before sowing,plant samples were collected at the early flowering stage,and pH value,total salt,nutrient and mineral element contents were determined.The results showed that feed rapeseed could reduce the pH value,total salt and Na⁺contents of saline-alkali soil,and Na⁺was mainly concentrated in the root system of feed rapeseed.The contents of available phosphorus and available potassium in saline-alkali soil could be improved to a certain extent by planting feed rapeseed,but there was no obvious advantage in the increase of content of soil organic matter in the same year after planting feed rapeseed(harvest at early flowering).After planting feed rapeseed,the content of available Fe in soil increased significantly,while the contents of available Ca,Mg,B and Mn decreased significantly.In conclusion,feed rapeseed has certain effects on soil improvement in saline-alkali land,and can improve soil fertility and soil environment.