Sr, Nd and Pb isotope analysis of four granulite samples and four gneiss samples from the northern Dabie Orogen were carried out. All the samples have relatively high Sr isotope ratios (87Sr/86Sr=0. 706 - 0. 746) and relatively low Nd isotope ratios (143Nd/144Nd= 0. 5108-0. 5124). These results together with Pb isotopic compositions suggest that the isotopic compositions of granulites and TTG gneisses of the northern Dabie Orogen are equal to those of the middle-lower crust. The TDM values show that these rocks are very old, c. 2-3Ga. The Sr-Nd-Pb isotopic characteristics of some samples imply the addition of younger crustal materials in their sources.