Abstract: 【 Objective 】 Evaluation of Enrichment Effect of Common Greening Tree Species on Expressway To find out the dominant tree species for heavy metal restoration in traffic roads in the hope of providing suggestions for the selection of green plants in arid oasis cities.【 Method 】 In this study, the common greening tree species on the side of Jingxin expressway in Urumqi were studied. The heavy metal content of each sample was determined by inductively coupled plasma emission spectrometer. The enrichment ability and transport characteristics of heavy metal Cu, Pb, Ni and Zn in soil by different greening tree species were analyzed. A membership function method was used to comprehensively evaluate the enrichment and transshipment capacity.【 Results 】 The results showed that the average values of Cu, Ni, Pb, and Zn in the rhizosphere soil were 40.27, 48.03, 29.24, and 120.77 mg / kg, respectively, which were 1.51, 1.91, 1.53, and 1.76 times the environmental values of heavy metals in Xinjiang soil. The Nemelo comprehensive pollution index was used to evaluate the study area, which was lightly polluted. Through the analysis of the heavy metal content of the tree species, the heavy metal content of the underground part of the tree species was higher than that of the above-ground part, which indicated that the Ulmus pumila and Picea koraiensis Nakai had a super-enrichment effect on heavy metals Pb.【 Conclusion 】 According to the analysis, the BTF of the five common tree species to the four heavy metals is Pb＞ Ni＞ Zn＞ Cu; The comprehensive transport capacity of various tree species to heavy metals Cu, Ni, Pb and Zn is: Ulmus densa＞ Ulmus pumila ＞ Picea koraiensis Nakai ＞ Pinus sylvestris var. mongolica ＞ Fraxinus chinensis Roxb.