Abstract: The eco-environmental effects of different plant community types in urban park green space are investigated by taking the green space where five plant community types are located in the Hohhot Arboretum as the research object and the square as the control point for air quality monitoring. The findings show that the human comfort index of five plant communities in the arboretum is at grade Ⅵ, and the concentration of NAI is at general level. The concentration of airborne particulate matter achieves the second level of national ambient air quality standard. It is found that the eco-environmental effects of some plant communities are better than that of the control point. When the weather is sunny and windless in summer, visitors are recommended to carry out recreational activities in plot S1(Juniperus rigida-Pinus syluestriformis-Platycladus orientalis) in the arboretum from 9:00 to 10:00 or after 16:00.