[Objective] Soil improvements resulted from different land use types were determined in a post-irrigation spoil area of the lower reaches of the Yellow River in order to provide scientific reference for soil & water conservation and vegetation restoration. [Methods] Three land use types as Robinia forest, poplar+peanut intercropped farmland and soybean farmland were selected in Xiaokaihe irrigation area of the Yellow River in Binzhou City. Anti-erosion ability, water storage capacity and nutrient content of the soils were measured. The functional soil improvements were comprehensively evaluated using membership function in fuzzy mathematics method. [Results] Obvious improvements of soil anti-erosion, physical structure, water storage capacity and nutrients were observed. The rank of soil anti-erosion ability was: tree-crop intercropping of poplar+peanut > soybean farmland > Robinia pure forest > bare land. Soybean farmland performed better in improving soil physical structure than Robinia pure forest and tree-crop intercropping did. Soil water storage ability ranked as: soybean farmland > Robinia pure forest > tree-crop intercropping > bare land. For improving soil infiltration and reducing surface runoff, tree-crop intercropping performed the best, followed by Robinia pure forest, and soybean farmland behaved the worst. In respect of the improvements of soil organic matter, available nitrogen and available phosphorus content, they performed as soybean farmland > tree-crop intercropping > Robinia pure forest > bare land; In terms of soil available K improvement, they ranked as: Robinia pure forest > soybean farmland > tree-crop intercropping > bare land. [Conclusion] Comprehensive evaluation of the three land use types on improving soil function in post-irrigation spoil area of the lower reaches of the Yellow River showed as soybean farmland > tree-crop intercropping of poplar+peanut > Robinia pure forest. Therefore, soybean farmland is suggested as first choice for the control of soil and water loss in this area, tree-crop intercropping type is also in the list.