Based on a study of Sidaohe area in UHP metamorphic terrane within the Dabieshan Mountains, it is discovered that there exist three types of rock associations, namely eclogite, gneiss and foliated garnet-bearing granites. Eclogites underwent retrograde metamorphism of different degrees, and amphibolites seem to be retrograded products from eclogites. Gneiss is the country rock of eclogites, and there exist mutational relationships in major element components. Major and trace elements and REE in foliated garnet-bearing granites are characterized by enrichment of SiO-2, K-2O Na-2O, Ga, Y and REE components and depletion of K-2O/Na-2O, Al, Ca, Mg, Ti and P. Combined with Rb-Hf-Ta diagram and isotopic and geochronologic data, it is held that this type of granites belong to post-collisional A-type granites. Based on the above evidence, the authors have reached the conclusions that continental slab underwent UHP metamorphism and produced eclogites during its subduction to the depth of the upper mantle, that extensive decompression retrograde occurred in UHP metamorphic rocks and produced amphibolites when UHP slab migrated to the middle and lower crust, and that the UHP slab, together with gneiss and foliated garnet-bearing granites, further moved from the middle and lower crust to the surface and experienced subsequent metamorphism and deformation.