Abstract: Based on the studies on heavy metals (Pb,Cd and Cu)in leaves of different plants, the pollution situation was determined for the Chemical plant of Nanjing (pollution reigon) compared to the Jiangsu Academy of Forestry as control sites, The accumulation ability of 14 virescence trees to 3 kinds of heavy metal in the atmosphere was dealt with in this paper. The results showed that the urban green tree species could absorb heavy metal pollutants to different extent depending on heavy metal kinds and tree species. Concentration measure of one tree species plant to these heavy metals was markedly different,and accumulation ability of green trees to Cu ranked first in heavy metals. Heavy metal content in leaves of plants in sampling reigon was obviouly higher than control sites. Populus deltoides, Magnolia grandiflora, Ligustrum lucidum and Prunus cerasifera have high absorption capacity to Pb, Populus deltoides have high absorption capacity to Cd,while Broussonetia papyrifera have high absorption capacity to Cu. And P. deltoides, B. papyrifera, Cedrus deodara, Magnolia grandiflora, Platanus hispanica and Koelreuteria paniculata have high absorption capacity to three kinds of heavy metals.

Key words: heavy metal, virescence trees, accumulation, Nanjing