Abstract: Urban plant diversity is the premise and foundation of the stability of urban ecosystem. This paper analyzed the current situation of plant diversity, and discussed the planning content and planning and construction strategies of plant diversity protection in Mile, in order to provide a basis for the effective protection of plant diversity in Mile. The results showed that the forest coverage rate of Mile city was 48.3%, and evergreen broad-leaved forest was the vegetation, there were 959 species of wild seed plants, belonging to 152 families and 536 genera. Among them, 6 species of gymnosperms belong to 3 families and 4 genera; angiosperms 953 species, 149 families, 532 genera; and 116 fern species, 28 families, 57 genera.On the basis of improving the current situation of plant diversity in Mile city, this study combined with the current situation and characteristics of plant diversity in Mile city, clarified the goals and principles of diversity protection, put forward specific protection measures and suggestions, and provided an important reference for the development of plant diversity protection planning in Mile city.