Trees can be planted every spring and autumn. Spring is generally from April to May, the temperature gradually warms up and the soil begins to thaw, which is suitable for transplanting tree planting, and autumn is generally 9- 10, with suitable temperature and more rainfall, which is suitable for tree planting, pruning and shaping. Planting trees is an important environmental protection action, which can effectively improve the environment, protect the ecology, increase the green coverage and reduce air pollution.