Abstract: 【Objective】 The aim of this study is to obtain the recommended amount of fertilizer for optimal input-output ratio in the hope of providing theoretical reference foundations for the efficient utilization of soil nutrients in Korla pear. 【Methods】 Effects of nitrogen, phosphorus and potassium fertilizer on growth, SPAD, specific leaf weight and net photosynthetic rate of single leaf were studied by using the ‘3414’ complete fertilizer scheme experiment. The recommended fertilization amount of Korla fragrant pear in the early fruiting stage was obtained by using the effect function of the unitary quadratic fertilizer effect function, binary secondary fertilizer effect function and ternary secondary fertilizer effect function, which provided scientific basis for the smooth transition fertilization in the early fruiting stage. 【Results】 The results showed that the nitrogen could significantly improve branch growth, but the phosphate fertilizer inhibited the growth of branches; Effects of nitrogen fertilizer on SPAD value, specific leaf weight and net photosynthetic rate of single leaf compared with phosphate and potassium fertilizer were the most significant; Potassium fertilizer could significantly promote fruit growth and effectively increase chlorophyll content in leaves. According to the fitting results of the seven equations, all of them were in accordance with the decreasing rate of return, and the interaction effect of the three fertilizers was PK>NP>NK, displaying positive interaction effect. 【Conclusion】 The fertilization recommendation amount in the early fruiting stage is N 167.48 kg/hm², P₂O₅ 118.65 kg/hm², K₂O 205.42 kg/hm² based on three dimensional quadratic regression equation, and the optimum economic yield is 2,915.99 kg/hm².