Eclogite that spreads over an area of some 50000 km2 in Hubei, Anhui, Jiangsu and Shandong Provinces of central China, comprises a rare, gigantic eclogite domain on the earth. Felsic gneiss is the preddmonant country rock around the eclogites. Both the eclogite and the felsic gneiss have not undergone the same high-pressure metamorphic event. On the basis of the intimate association between eclogite and ultrabasic-basic rocks and the occurrence, structures and textures and alteration of minerals and geochemical features of eclogites and relevant rocks, the e-clogite is postulated to be originally a basic plutonic rock, and the source rock for the felsic gneiss to be intermediate to acid granitoids. During the collision process of the North China and Yangtze plates, the preexisting eclogite and melanoeratic rock series formed in the upper mantle or between the mantle and crust were broken and trapped in the granitic magma produced by the collision; then the granitoids with melanoeratic rocks were uplifted and emplaced in the pre-Palaeo-zoic and partly Palaeozoic rocks. Later they were together modified by multiple of tectono-mag-matic thermal events in the Phanerozoic and finally assume the present complex appearence.