Abstract: The accumulation ratio of element in trees, that is the ratio of the element content in trees to that in the soils (T/S), was used to analyze the accumulation characteristics of elements in the tree-soil system in mining area of Xixia mountain, Nanjing. The results showed that the content of K, Ca and P had little relations with the tree species, or human mining activities. Different tree species had the largest T/S for different elements. For example Pinus thunbergli for Cr and Alp P. massoniana for Mn,Pb, Co and Ni; Pterocarya stenoptera for P; Robinia pseudoacacia for Cu. The age of Pinus thunbergli had some influence on the content of Co, K and Zn, and the T/S of Ca. There was a positive correlation between the T/S curves of Co and Ni, and of Sr and Ba; indicating a geochemical conjugation of these two pairs of elements.