The implementation of the high-stem-changing technique for chestnut trees will make them a new breed with high yield and high quality, and can achieve higher economic benefits. In late March of spring-mid-April, the sap has started to flow and the bark is easily peeled off; the temperature is generally between 15°C and 25°C, and the temperature rises quickly. As long as the technology is strong and managed properly, the survival rate of grafting can be above 95% during this period. First saw 1/2-2/3 of the big branches, cut the rootstock trees, and use the splicing or subcutaneous connection method. When the big branches are not peeled off, take a splicing. The thicker cross-section can be split vertically and horizontally into a "10" shape, and four wax seal scions are grafted. The lower end of the wax-sealed scion is cut into a 5-cm wedge, and then inserted into the palpebral fissure. Be sure to match the formation of the stem. After inserting the scion, it is necessary to leave a 0.3-0.5 cm "leftover" on the cut surface. Finally, the ribbon-shaped plastic rice film tightly binds the joints and cannot leave a "tuyere". 1 Eradication of Sprouts In order to ensure the full use of nutrients in the tree, all the sprouts on the trunk should be removed at any time. 2 Post wind protection When the shoots grow to 25-30 centimeters, pillars should be set up. Fasten the struts to the branches and tie the new shoots to the struts. The length of the pillar is about 1 meter. 3 Timely picking up when the new shoot grows to 20-30 centimeters, the first picking up will be carried out. After that, it will be able to carry out the second and third pickings each time it grows to 20-30 centimeters. 4 Diseases and insect pests were found to be harmed, and spraying was prevented and prevented in time. 5 Fertilization Watering In addition to basal fertilization in early autumn, fertilizers should be applied once in mid-June and late July. If the weather is dry, it should be watered in time. 6 Before the rainy season of the lashings came to an end, all the banding and pillars of the banded plastic film were released.