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Transplanting large trees into forests has become an important technology for urban forest construction. However, this technique is more suitable for broad-leaved trees with stronger sprouting ability, such as eucalyptus, and the survival rate is slightly higher; however, for conifers, pine trees are difficult to transplant successfully. Because the technical point of this technology is to cut off the roots, the big tree is made into subbells and planted in the city. After planting, it is necessary to livelihood, grounding, and long branches. Even if it survives, it will take at least 10 years because the big roots are cut off. If there is a slight gale in the past 10 years, it may be blown down. Since the big branches are cut off, it will take at least 10 years to regenerate a large canopy. The photosynthesis of the trees in these 10 years is negative, that is, the release of carbon dioxide is much more, and oxygen is produced. Too few have lost the most basic ecological functions of the trees themselves. How to make a big tree transplant successful, and require a high survival rate, roots firmly, the crown remains the same, this is an urgent need to solve the technical difficulties in urban greening. This is actually a tree problem. If the tree can be uprooted and the main root is not transplanted, this problem is easily solved. Here is an explanation of a method of irrigation, which can completely solve this problem. The principle is to use water as a lubricant and bulking agent to reduce the firmness of the roots and soil, and then use a crane to uproot the large trees and transplant them to new planting sites. This can be done without damaging the roots, that is, planting and living. Such trees as pines, which are difficult to transplant and survive, can also be successfully transplanted in this way, enriching the urban and plain afforestation tree species. The specific method is to drill holes around the soil distributed in the roots of the large trees to be transplanted. The trees are mostly hit and the trees are used less, and then the water is poured to make the soil around the roots into a slurry. And do a good job in the branch of the big tree liner, tied with iron chain, connected with the crane, the uprooted tree. There are 3 points worth noting: First, to fully irrigate, that requires full penetration, otherwise it may be broken when the crane lifts the main pole; Second, the lifting branch must be lined evenly, so that part of the force distribution, so as not to During the lifting, the phloem of the trees is injured; third, the direction of the lifting force must be consistent with the direction of the trunk to reduce the force so as not to break the trunk, because the radial tensile strength of the trees is far greater than the transverse bending strength of the trees.