【Objective】The PM2.5 retention capacity of plants under different configuration modes in the road green belt was studied in order to provide a scientific basis for the selection of urban greening tree species and urban ecological planning.【Method】Thirteen kinds of common road greening plants were selected to study the PM2.5 retention capacity of unit leaf area,single plant and unit green area of the road green belt in Changsha City through the microporous membrane weighing method,and the dust retention capacities of tree shrub pure forest,t...