Abstract: In view of the dual role of garden green space in urban atmospheric environment, this study comprehensively evaluated the differences of PM2.5 pollution reduction ability of different plant species in order to provide scientific basis for the optimization and upgrading of urban green space function. Based on the current model of calculating the quality of fine particulate matter retained in plant leaves, taking the contribution of VOCs released by plants to the concentration of atmospheric particulate matter as an influencing factor, the net benefit of reducing fine particulate matter by plants was studied. The results showed us that: (1) there were big differences among the plants individuals of the capability of fine particles retention by trees in every unit leaf area for 7 days. Deciduous tree of Acer truncatum (0.606 g/m2) was more than 14 times as Aesculus chinensis (0.044 g/m2). Evergreen tree of Sabina chinensis (0.173 g/m2) was more than 2 times as Pinus tabuliformis (0.077 g/m2). (2) Pinus tabulaeformis, Cotinus coggygria and Sabina chinensis have higher contribution to the generation of SOA due to their higher release of alpha-pinene. (3) Comprehensive evaluation of the net benefits of reducing fine particulate matter in plants, Cotinus coggygria and Pinus tabulaeformis did not reduce PM2.5, but increased the concentration of PM2.5 in air. The other 13 plants all had a reduction effect on PM2.5, including Weigela florida and Acer truncatum. Leaf area had the strongest ability to reduce PM2.5.