The best time for peach tree grafting should be early March, during which the buds of peach trees begin to sprout and become bigger, the nutrient layer just begins to be active and the nutrients begin to flow. Grafting is beneficial to survival at this time, but the specific time is only approximate. If the grafting time is accurate, it depends on whether the buds on the branches begin to move and sprout. 1. Plants should choose robust trees under the age of 10. If the tree is weak but young and has the ability to rejuvenate, it should be replaced after strengthening the management and rejuvenation of soil, fertilizer and water, or all management work should be done immediately after replacement, so as to rejuvenate as soon as possible. Tree age 1 1 ~ 20 years, and trees with great potential can be replaced. Trees over 20 years old have no substitute value. Two, variety selection in accordance with the "local conditions, according to the city, foster strengths and circumvent weaknesses, give play to the advantages" principle. Early-maturing varieties suitable for planting in most parts of Yunnan include ZaoXia Lu and Chunhua, early-maturing varieties include Bumu Zaosheng, Rose Dew, Snowland Dew, Yuhua Dew and Qingfeng, and middle-maturing varieties include Zhao Xia, Xiaolin Shuimi, Xiahui No.4 and Jinglihe. Ultra-early-maturing varieties of nectarine are Qinguang Bud Mutation and Mayfire, early-maturing varieties are Shuguang, Yan Guang and Huaguang, and intermediate varieties are Early Red Spider, Mo Dan, Red Coral and Ruiguang 18. Third, choose the tree shape according to the planting mode and density. The plant spacing of 3 ~ 3.5m× 4 ~ 4.5m naturally likes three main branches, and the plant spacing of 2 ~ 2.5m× 4 ~ 6m is Y-shaped with two main branches. Four, the number of nodes should not be too much, generally 15 ~ 20 big trees, 9 ~ 12 medium trees and 3 ~ 4 small trees. V. Replacement method (1) In February after the replacement of beginning of spring in spring, according to the plastic requirements of replacement, the big branches were sawed off, and the anvil piles were replaced, and the replacement was completed by splitting or oblique cutting and belly-in. Its advantages are long growth period in the current year, rapid recovery of crown, flower bud formation in the current year, and fruiting in the next year. The disadvantage is that some joints have a large cross section, and the new callus is not easy to wrap the joints tightly, which is easy to cause dry rot of the wood of the anvil stake and affect the growth and life of the joints in the later period. (2) Shaping in spring, that is, sprouting in summer. According to the requirements of shaping, straighten the rootstock stakes with branches left when sawing rootstocks in spring, so that the hidden buds can sprout new branches, and remove the redundant branches in summer. Graft the branches 5-8 cm away from the base with T-bud grafting or sticking buds, and fold the rootstock (2/3, 2/3) at the joint 5-8 cm 10 day after grafting. The advantages are that the cross section of the interface is small, the new tissue can easily wrap the interface tightly, and the tree is not prone to premature aging; The disadvantage is that the crown recovery is late and the production of high yield is delayed by one year. Management of intransitive verbs after (1) Wipe all sprouting tillers in time except the sprouting anvil. (2) When the branches on the scion with pleura are released to 40 cm long, the membrane is released. The premature release of membrane and the failure of callus growth at the interface affected the survival and growth of new branches. If it is too late, it will hurt or even break the scion, and all previous efforts will be in vain. (3) Strengthen management. Like regular peach trees, timely and carefully manage soil, fertilizer and water, prune and control pests and diseases. Low-yielding and inferior trees such as plum, apricot, plum and cherry can also be transformed in this way.