Abstract: In order to reveal the unifoliate dust detention of city green trees in Zhenjiang, 37 afforestation trees were selected and the unifoliate dust detention was analyzed. The results indicated that the unifoliate dust detention of Viburnum odoratissimum, Osmanthus fragrans, Fatsia japonica and Eriobotrya japonica were the best and belonged to the first category, the second category included Ligustru皂quihoui, Loropetalum chinense, Platanus hispanica, Cinnamomum camphora and Nerium indicum Mill, and were in the intermediate level. Populus tomentosa Carr, P. alba, Magnolia grandiflora, Cercis chinensis Bunge, Broussonetia papyrifera, Ilex cornuta, Fraxinus chinensis, Ailanthus altissima, P.canadensis, L援lucidum Ait, Prunus serrulata and Yucca gloriosa, L援quihoui Carr, Liquidamba formosana Hance, P. ceraifera, Pittosporum tobira, Syringa oblata, Acer buergerianum, Robinia pseudoacacia L援, Peach, Ginkgo biloba, Buxus megistophylla, Pterocarya stenoptera, Photinia serrulata, P. davidsoniae, A. palmatum Thunb, Sophora japonica Linn and B.sinica were in the third category.