Abstract: Based on long-term monitoring at 33 fertilization positioning sites in Beijing, this study analyzed the impacts of different fertilization measures, years, types and planting methods on the soil nutrient content. The results revealed that long-term fertilization significantly increased the nutrient content in farmlands. The average soil organic matter increased from 13.8 g/kg in 2008 to 25.05 g/kg in 2022, with an annual increase of 0.75 g/kg. At the same time, the growth rates of available P and available K were very high, with mean growth rates of 158.38% and 158.67%, respectively. Compared to no fertilization, the application of organic fertilizer, and the combined application of organic and inorganic fertilizers significantly increased soil organic matter content. However, only the combined application of organic and inorganic fertilizers significantly increased the content of total N, alkali-hydrolyzable N, available P, and available K. When the continuous input of organic fertilizer nutrients (N+K₂O+P₂O₅) was less than 900 kg/(ha·a), equivalent to a physical input of organic fertilizer of about 22.5 t/(ha·a), the organic matter in farmlands increased with the increase in nutrient input. Similarly, When the total fertilizer nutrient input was within 900 kg/(ha·a), the soil nutrient content increased with the increase in nutrient input. Furthermore, the soil nutrient content of farmlands in the plain agricultural areas was the highest, followed by the suburban agricultural areas and the mountain ecological conservation areas. Moreover, the nutrient content in vegetable fields was significantly higher than that in orchards (p<0.05). This study offers scientific guidance and reference for the rational fertilization of arable lands in Beijing.