The precambrian terrane in the Dabie Mountains is a composite metamorphic terrane formed, most probably, by collision-convergence between the North China and Yangtze continental blocks. The Xingcheng-Qichung fault zone is one of the most important tectonic boundaries within this composite terrane. In the present paper the terrane is divided, into two major tectonic units (second-order metamo-rphic terranes) by that tectonic boundary: the metamorphic terrane on the north margin of the Yangtze continental block (NMY) in the south and the metamorphic terrane on the south margin of the North China continental block (SMNC) in the north. The two metamorphic terranes show significant differences not only in geophysics and tectonic deformation but also in their material composition. The differences in material composition are manifested in metamorphic stratigraphy, metamorphism and magmatism. The two metamorphic terranes are characteristc by their own metamorphic stratigraphic systems undergone different types of metamorphism and by entirely different features of magmatism. The differences in composition of the southern and northern Dabie terranes indicate that during the convergence-collision of the two continental blocks the NMY might have been subducted northward beneath the SMNC. This would be a longterm and complicated orogenic process which had probably begun in the Mid-Late Proterozoic and ended in the Jurassic. The P-t path of the SMNC metamorphic terrane suggests a two-stage convergence. The geological characteristics of eclogite and its associated ultramafic rocks show that some of the eclogite were probably brought up by ultramafic magma from the deep level of a subduction, zone to the lower crust and then emplaced to the shallow level of the crust by tectonic processes.