Abstract: 【Objective】 To study the dynamic changes of endogenous hormones and carbon and nitrogen nutrition in different parts of leaves of Korla Fragrant Pear tree in the hope of providing theoretical basis for pear tree shaping and pruning. 【Methods】 Korla fragrant pear with a tree shaped main stem was used as the research object and samples of different parts of Fragrant Pear leaves were collected at 2 weeks((2 weeks after pollination,2WAP), 6 WAP, 10 WAP, 14 WAP, 18 WAP, and 22 WAP after pollination. Then the changes in endogenous hormones GA₃, IAA, ABA, ZR, total nitrogen, and total carbon in the leaves were measured and analyzed in different developmental stages. 【Results】 There was a certain pattern in the content and trend of endogenous hormones in the leaves of different parts of the Korla pear tree. From 2 WAP to 14 WAP after pollination, the contents of GA₃ and IAA in different parts of the leaves of the Korla pear tree remained at high levels, while ZR and ABA showed a"low-high-low" trend; After 14 WAP, the content of GA₃, ABA, and ZR in the leaves showed a decreasing trend, while the content of IAA showed a "high-low-high" trend. The variation trend of IAA/ABA and (IAA+ZR+GA₃)/ABA ratios in different parts of Korla pear leaves in different developmental stages showed a "W" shape. The ratio continuously decreased to the lowest value from 2 WAP to 6 WAP, and slowly increased from the lowest value from 6 WAP to 10 WAP. The ratio from 10 WAP to 22 WAP first decreased and then increased. The IAA/ABA and (IAA+ZR+GA₃)/ABA ratios were higher in the upper part than in the middle and lower part; During the growth period, the total carbon content of Korla pear leaves in different parts showed an overall trend of first decreasing and then increasing, while the total nitrogen content showed an overall trend of first decreasing and then slowly increasing. The C/N ratio showed an overall upward trend, and the total carbon and total nitrogen content of leaves in different parts showed a upper>middle>lower pattern. 【Conclusion】 There are certain patterns in the changes of endogenous hormones and carbon and nitrogen nutrition in different parts of leaves of Korla Fragrant Pear.