Abstract: 【 Objective 】 To study the difference of light energy utilization between upper and lower walnut leaves after circumferential peeling of main branches of walnut in the hope of providing technical support for improving quality and increasing efficiency of walnut in Xinjiang. 【 Methods 】Three walnut trees with the same growth were circumcised in the lower part of the empty main branch of the inner hall, and the new branches were germinated for grafting. Three intact walnut trees were selected as control. The light response curves of walnut under 17 different light quantum flux densities were measured by Li-6400 portable photosynthetic analyzer. 【 Result 】The light response parameters of the upper and lower parts of the walnut main branch are not consistent with the optical response parameters of the unpeeled walnut leaves: the amax, lsp, lcp, rd of uncarved walnut leaves were all higher than those of the carved walnut leaves, and the AQY at the lower part of the bud was the largest, indicating the largest slope of the photosynthetic curve at the upper part of the bud in the weak light stage. the Gs, Tr, and Ci values of the leaves in the lower part of the cut bud were all higher than those in the upper part of the uncut bud and the cut bud. With the enhancement of PAR intensity, Tleaf also changed, and on the whole, the leaf temperature of the upper part of the bud engraving was the lowest. 【 Conclusion 】The results showed that the nutrition loss and photosynthesis were weak in the upper part of the circumferential peeling, but the new branches germinated in the lower part of the circumferential peeling had good growth and timely nutrition supplement, so they were suitable for grafting the new branches.