Soil fertility and mineral N accumulation of slope apple orchard on the Loess Plateau are studied.Results show that soil appears low-fertility due to the serious lack of N and P. Soil is sandy loam，with better soil aeration and poor water and nutrient retention. Fertility status of slope apple orchard on the Loess Plat-eau is low on the whole. The content of soil nutrients of the 0-60 cm soil layer is as follows:organic matter is 9.24-28. 12 g/ kg;total N is 0. 22-0. 60 g/ kg;available P is 0. 17-16. 08 mg/ kg;and available K is 80.06-168.39 mg/ kg. There are NO3- -N enrichment layers below 2 m of slope apple orchard on the Loess Plateau.Different fertilizations have significant effects on the NO3- -N distribution and its content in the soil profiles，while the NH4+ -N distribution and its content were relatively constant.For more N treatment，the NO3- -N enrichment depth increases，while for more P treatment，the NO3- -N enrichment depth decreases in the soil profiles.