This article aimed to conduct a study on the urban forest system in Miluo City, analyze the existing problems and provide theoretical references for the construction of the urban forest in Miluo City.

The sample plot method and sample line method were used to study the four main types of urban forests in Miluo City: parks, campuses, residential areas and roads. The species richness, Shannon index, Simpson index and Pielou evenness index were calculated, and the species composition characteristics, species diversity and overall growth characteristics of the four types of urban forests were analyzed.

1) The study showed that there were 44 families, 94 genera, and 120 species of angiosperm plants in the urban forest of Miluo City. The main species were Fagaceae, Rosaceae, and Magnoliaceae, accounting for 36.4%, 22.7%, and 11.2%, respectively. 2) The species diversity in Miluo City was not high, and the overall number of arboreal species was relatively scarce. Among the four types of urban forests, parks had a relatively high level of species diversity and a relatively uniform distribution of tree species. The species diversity level on roads was relatively low, which varied greatly. 3) The tree height distribution in the urban forest of Miluo City was concentrated in the range of 5-10 m, and the proportion of tall trees higher than 20 m was relatively small. The diameter distribution generally showed a trend of “less at both ends and more in the middle”, the diameter of the forest trees was concentrated between 10 cm and 20 cm, and the proportion of tall trees with a diameter greater than 30 cm was relatively small.

The urban forest vegetation of Miluo City is still dominated by a few species, especially the road forest belts in the urban and rural areas. The tree species are few with smaller specifications, which species diversity has great potential for improvement. It is suggested to plant local characteristic native species and strengthen the cultivation of urban forests. The overall diversity of urban landscapes is low, and the average crown diameter of road trees is Ⅳ (> 6 m), which accounts for 20% of the total and does not meet the national forest city evaluation index. It is necessary to pay attention to the application of tall trees and strengthening the cultivation of urban forests, to improve landscape quality and enhance the application of arbor species with colored leaves, flowers and fruits to improve the quality of urban forests.