Abstract: Greenbelt soil in the new district of Yanan was studied by physicochemical indexes measurement, and the fertility was evaluated according to the classification criteria for soil nutrients inThe 2nd National Soil Survey and Nemorrow formula, to provide a basis for road greening. The results indicated that soil organic matter and available potassium were in grade 4 (low level) with the average amounts of 14.37 g/kg and 53.00 mg/kg, respectively. Available nitrogen was in grade 5 (low level) with an average amount of 34.28 mg/kg, available phosphorus was in grade 6 (very low level) with an average amount of 2.64 mg/kg. The pH value was 8.25-9.39, which was alkali to high alkali. Soil bulk density was 1.02-1.73 g/cm3, and the porosity was low. The total salt was 0.45-1.48 g/cm3, soil salinization was serious. The Nemerow analysis showed that the border tree soil in the new district was in grade 4, poor fertility level (<0.9). Based on these results, some measures were proposed, such as using organic fertilizers, planting green manure plant, improving soil alkaline, to improve the soil fertility.