Using the single zircon U-Pb technique, the authors have geochronologically investigated two glaucophane eclogites sampled from Gaoqiao and Chenjiadian in western dabie Mountain, which provide the age information ofHP/LT(high pressure/low temperature) metamorphism and their Archean protolith. Seven analyses of zircons from the Gaoqiao eclogite and five analyses of zircons from the Chenjiadian eclogite have yielded the lower intercept ages of 1138± 39 and 1127±234 Ma and the upper intercept ages of 2872±40 and 2674±249Ma. Considering the petrological evidence and tectonic evolution of the Dabie orogenic belt, the ages of 1138 and 1127 Ma are regarded as the time of HP/LTmetamorphism, and the protolith of the eclogite is dated at 2647-2872 Ma. The present work confirms the existence of an Early Jinning HP/LTmetamorphism in the Dabie orogenic belt, which represented the closure of the ancient Dabie ocean. Moreover, the primary opening of the Dabie ocean occurred at Neoarchean. All this suggests that the tectonic evolution during the Jinning period took place under the plate-related mechanism.