Effects of different soil amendments on soil compaction and growth status of oat were studied.Results showed that all the soil amendments could reduce soil compaction;the order of them was potassium polyacrylate+potassium humate>polyacrylamide+potassium humate+potassium humate>potassium polyacrylate>polyacrylamide>potassium humate> CK;and soil compaction increased with the increase of soil depth.Soil amendments significantly increased plant height of oat and dry matter weight,and the height for the mixed use was higher than the single use.Grain yields under the amendment treatments were significantly higher than that under the control.The yields for potassium polyacrylate+potassium humate and polyacrylamide+potassium humate were higher than that for the single use,being 4 694.2and 4 566.9kg/hm² with the increments of 21.66% and 18.36%,respectively.Biological yield had the same effect as grain yield.The WUE under the amendment treatments was significantly higher than that under the control,and the WUE under mixed amendment was higher than that under other soil amendments.