Abstract: By using dendrochemistry method of tree rings, the variation characteristics of eight heavy metals (Pb, Cd, Cr, Mn, Cu, Zn, Sr and As) in the tree rings of Abies fabri in the eastern margin of the Qinghai-Tibet Plateau during the past 150 years were discussed, and the possible sources of heavy metal were also discussed. The results showed that Mn, Cu and Zn, as the essential elements for plant growth and development, their contents were significantly higher than the other five heavy metals. Among the eight heavy metals, except Mn and Cu, the content of the other six heavy metals showed a complex change trend. The correlation analysis and cluster analysis show that Cr, Sr, Pb, and As in the tree ring are one type, which are mainly affected by the combined effects of human and natural sources; Mn, Zn and Cd belong to the same category and are mainly affected by man-made pollution sources; Cu elements are classified separately and largely derived from crustal sources. The heavy metal content in tree rings in the eastern margin of the Qinghai-Tibet Plateau is relatively low, but with the increase of industrial production activities, the heavy metal content has increased. Through the analysis of the heavy metal content in tree rings in this area, it is helpful to reconstruct the history of heavy metal pollution in this region.