There are abundant dark inclusions in the Neoproterozoic tonalite pluton near Mozitan town, northern Dabie Mountain, which probably contain some information on the early evolution of the crust in this area. Preliminary studies of three inclusions have revealed amphibole facies of the main stage of metamorphism with constituent minerals of feldspars, amphiboles,chlorites and opaque minerals. These inclusions underwent relatively intense mylonitization of post-metamorphism, probably associated with activities of Xiaotian-Mozitan faulted zone. No veins of syn-or post-metamorphism exist within and around the inclusions. Chemical analysis othree inclusion samples shows that major elements are characterized by SiO2content of 49.10% ~53.27%, TiO2of 0.74%~1.32%, Al2O3of 11.80%~15.72%, Na2O of 1.39%~ 3.58%,K2O of 4.32%~6.17%, P2O5of 0.82%~1.02% and REE abundance of 332.85× 10-6~440.23×10-6, with obvious enrichment of LREE and no evident Eu anomaly for right_dipping REE patterns, Their143Nd/144Nd ratios are 0.511790~0.512185,εNd(0) are equal to -8.9~-17.6 and87Sr/86Sr are 0.708732~0.709417. Sm-Nd dating for these samples yields depleted mantle model ages of 1854 Ma, 1899 Ma and 1578 Ma. No evidence of metasomatism in these inclusions can reach the following deductions on the basis of above data: (1) primary protoliths of these inclusions may be alkaline-rich basic magmatic rocks which were probably formed in the extensional tectonic setting within continents, (2) Precambrian bodies much older than the rocks may exist in Dabie Mountain, and Dabie metamorphic complexes were possibly part of the early Precambrian block.