Abstract: To investigate the issue of precise nitrogen fertilizer application for peanut in soils with extremely abundant phosphorus and potassium in Dayang Township, Hanjiang District, Fujian Province, a field experiment was conducted following the "2+X" experimental design specified in the Technical Specification for Soil Testing and Formulated Fertilization（Revised 2011）. Five nitrogen application treatments were set up, including a nitrogen-free treatment（N0）, 70% optimized nitrogen treatment（N1）, optimized nitrogen treatment（N2）, 130% optimized nitrogen treatment（N3）, and 150% optimized nitrogen treatment（N4）, to investigate the effects of nitrogen application rates on agronomic traits, yield, soil physicochemical properties, and nutrient uptake of peanut.The results showed that the 130% optimized nitrogen treatment（pure N 126 kg·hm⁻²）achieved the highest peanut yield of 4778.0 kg·hm⁻², which was a significant increase of 25.37% compared with the nitrogen-free treatment, bringing an additional economic benefit of 1320.27 CNY·hm⁻².Considering comprehensive factors including yield, economic benefits and soil sustainability, under the conditions of yellow-based calcareous clay paddy soil in this region（with available phosphorus 784.7 mg·kg⁻¹and available potassium 350.0 mg·kg⁻¹）, the recommended pure nitrogen application rate of 126 kg·hm⁻²was determined as the optimal scheme for high peanut yield. This finding provides a scientific basis for the precise application of nitrogen fertilizer for peanut in the local area.