Due to the widely existence of soft rock and the exploitation of coal resource, serious ecological and environmental problems occurred in the contiguous areas of Shanxi, Shaanxi and Inner Mongolia in China. In order to restore regionally ecological environment, this study was conducted to improve sandy soil using soft rock in the energy communities, and realize the transformation of soft rock into available resources. Previous research found that soft rock could improve hydraulic properties of sandy soil. But there are few researches about the nutrient availability of soft rock distributed into sandy soil. Soft rock was mixed in sandy soil with seven ratios: 0，10%，25%，50%，75%，90% and 100%. Adsorption kinetic were determined and fitted with Freundlich，Langmuir，Temkin and DubininRadushkevich models. Adsorption isotherms were measured and modeled with Pseudofirstorder, Pseudosecondorder, Biconstant and Intraparticle diffusion models. This study was conducted to understand the effects of different additive proportions of soft rock amended sandy soils on the adsorption of NH+4 N, and to select the optimal adsorption model of improved soil. The results can be used to guide reasonable fertilization of nitrogenous and improve the utilization efficiency of fertilize. The results showed that: with the extension of reaction times and the increase of equilibrium concentration, the NH+4 N adsorption capacity was increased in improved soil. Reaching to the adsorption equilibrium, sandy soil needs 4 hours and soft rock needs 16 hours. Adsorption capacity of NH+4 N was the largest in sandy soil and the least in soft rock, the maximum adsorption of NH+4 N in soft rock was 20 times of sand soil. With the increase of the soft rock proportion in improved soil, NH+4 N optimal adsorption was increased linearly. Soft rock could improve the NH+4 N adsorption capacity of sandy soil. The pseudosecondorder kinetic model and the Freundlich isotherm model could well describe NH+4 N absorption in improved soil. NH+4 N adsorption is a spontaneous process and a favorable adsorption.