As the network and skeleton of urban green space system, road greening has become the main component of system continuity and plays an outstanding role in directly reflecting urban landscape. In the selection and application of street trees, urban roads are dominated by deciduous broad-leaved trees, which are shaded by green trees and have beautiful shapes. Suburbs and general grade highways pay more attention to maintenance cost factors such as rapid growth, pollution resistance, barren resistance and easy management. The selection and application of street trees in memorial places such as tunnels and tombs are mainly evergreen conifers, such as juniper, cypress, cedar and masson pine. Deciduous trees include willow, locust and elm. In addition, palm trees are often selected. In recent years, with the improvement of urban environmental construction standards and the implementation of greening, purification, beautification and aromatization indicators, the selection and application of evergreen broad-leaved trees and colored fragrant flower trees have made great progress and are on the rise. At present, the commonly used street trees are Platanus acerifolia, Tilia amurensis, Ulmus pumila, Aesculus aesculus, Maple, Camptotheca acuminata, Ginkgo biloba, Liriodendron hybrid, Cinnamomum camphora, Magnolia grandiflora, Michelia Lechang, Ligustrum lucidum, Tung Tree, Poplar, Willow, Sophora japonica, Taxodium ascendens and Metasequoia.