Abstract: The Dulan eclogite-bearing terrane is the only coesite-bearing ultrahigh-pressure (UHP) metamorphic terrane so far recognized in the 700 km-long North Qaidam-Altun eclogite belt. The key feature of the Dulan terrane is that it consists of two sub-belts, the north Dulan belt (NDB) and the south Dulan belt (SDB) with different exhumation processes and histories. Coesite pseudomorphs in garnet and omphacite, together with p-T calculation, suggest that the peak metamorphic stage of eclogite in both belts is well within the stability field of coesite (p =2.8-3.3 GPa). The retrograde p-T paths are much different between the north and the south belts. The p-T path of the NDB eclogites suggests that the NDB eclogites underwent two stages of exhumation, an earlier rapid exhumation from a mantle depth to a middle crust level with a near-isothermal decompression, and a later uplift to the Earth’s surface. The SDB eclogites, on the other hand, were strongly overprinted by a high-pressure granulite-facies metamorphism under conditions of p =1.9~2.0 GPa and T =873~948℃, followed by temperature and pressure decrease to the amphibolitefacies. The process of temperature increase with decreasing pressure from UHP eclogite to high-pressure granulite suggests that the SDB eclogites exhumed at low speed and underwent strong thermal relaxation at a level of crustmantle transition or thickened lower crust. This thermal relaxation may occur in most UHP metamorphic terranes and may be the major mechanism for eclogite anatexis. The different metamorphic evolutional paths of the two sub-belts signify the differential exhumation histories of the subducted continental crust.