Abstract: In this study,investigations were conducted on the plant resources and vegetation distribution along the expressway from Chengdu to Yibin,aiming to provide the current information for the environmental impact assessment of the project construction,and the basis for the project construction to take reasonable environmental protection measures.The results showed that there were about 575 species of vascular plants in the scope of the investigation,belonging to 125 families and 360 genera,including Alsophila metteniana, Cibotium barometz,and Cinnamomum longepaniculatum(3 species National key protected wild plants).The vegetation types of investigation areas were dominated by cultivated vegetation which was composed of artificial forest,economic forest and crops,and natural vegetation was relatively small.The natural vegetation type was mainly warm coniferous forest whose main species were Cupressus funebris and Pinus massoniana,bamboo forest mainly included Neosinocalamus affinis, Phyllostachys heterocycla, Phyllostachys bambussoides,etcetera,and deciduous broadleaf shrubs were principally composed of Vitex negundo, Broussonetia papyrifera, Rhus chinensis,etc.