Grafting of four-year-old peach trees: Because the four-year-old peach trees are large and the annual new branches are on the outside, it is not suitable to adopt the method of bud grafting in summer, but the method of branch grafting in spring should be adopted. Grafting time: mid to late March (in early March, new varieties of scions are prepared before germination and stored at 0-5℃ for later use); Grafting method: skin grafting or top incision; Before grafting, do a good job of shaping (pruning according to the shape of happiness), leave more back branches and flat branches, not back branches, and leave the reserved branches short15-20 cm; When grafting, wrap it tightly with a plastic film about 10 cm wide; After grafting, remove the sprouting tillers on the rootstock in time to concentrate nutrition for the growth of grafted buds; When it grows to more than 30 cm, tie a post to prevent the wind from folding.