Elm pruning is mainly for shaping, so it is necessary to keep necessary branches for shaping. When pruning, you can give priority to pruning dead branches, diseased branches and weak branches on elm trees, and then cut off branches that are too vigorous, as well as many branches that cross, parallel, oppose each other and affect appreciation. When trimming, pay attention to the smooth incision and don't leave residual branches. When pruning shaped elms, usually only the branches are pruned in a controlled way. For the growing elm, it is not suitable to prune the shoots during the growing period. The best time for pruning is winter, which is beneficial to the growth of the next spring. Elms need pruning before planting. Pruning roots and branches and applying erythromycin ointment to the incision are helpful for the survival of plants. With the growth of elms, they need pruning and shaping to be more ornamental. Generally, there are many production forms, such as straight dry type, inclined dry type, curved dry type, cliff type, waterfront type, jungle type, wind-blown type, stone-attached type and so on. When pruning, cut short long branches and thin branches. Plant height is controlled by coring to promote the growth of lateral branches. Picking buds can avoid the disorder and cross of elm branches, which will affect the appreciation. In addition, pruning is used to keep the shape beautiful. Pruning is an important pruning work, which can be carried out according to the situation of the tree. Trim the branches flat and cut off the dead branches that hinder the viewing. Another point is that changing pots can trim the roots. Pruning roots can make plants grow better.