In the process of cultivating elm bonsai, it is necessary to change pots regularly to avoid that the soil space is too small and the nutrition is insufficient to meet the growth needs of plants. It is best to change pots once every two years. In the process of changing pots, the roots of elm trees should be cut off to help plants preserve nutrients. Elm is a kind of light-proof plant, which is easy to grow white due to insufficient light, which affects the beautiful shape of the plant. Therefore, it is necessary to put elm bonsai in the process of cultivation. Let plants receive all-weather natural light, but when the light is too strong in summer, we should draw a sunshade net on the elm to avoid sunburn, which will easily attract pests such as aphids and scale insects during the growth of the elm, causing its leaves to be damaged and infected with diseases. During the cultivation period, once the insect leaves are found, they should be cut off and burned with scissors in time, and then the elm bonsai should be sprayed with omethoate once a week, and the plants will be restored after three consecutive sprays. Keep the basin soil moist and free from water stains. Elms like to live in wet places, but they are also afraid of water stains. Therefore, water should be sprayed thoroughly, once in the morning and once in the evening in midsummer. In case of waterlogging, dredge it as soon as possible. Proper fertilization. Peanut cake can be boiled into liquid fertilizer, or it can be broken into thumb size and buried in the soil. Xiji uses some compound flower fertilizer. Fertilization should be applied once in early spring and early autumn, not more. Trimming and shaping should be timely. Elm has a strong budding ability, and the leader of the third group is also very fast. If not trimmed, the pile landscape will lose its ornamental value. Trimming and shaping can be done in autumn. Cut off useless branches and diseased branches first, and then trim them in a formed or formed posture.