Abstract: Abstract: Duobaoshan copper deposit, a famous porphyry deposit in northern China, has been extensively studied on its origin, tectonic environment and metallogenic mechanism by many scholars, and significant advances have been achieved.In constrast, the preservation and later geological alteration of the deposit have been little researched.It is necessary to constrain the exhumation depth, metallogenic stage and age of the deposit using medium-low temperature thermochronology, in particular, the emplacement depth of ore-hosting rock body should be first known.In this study, in order to accurately determine the emplacement depth of the ore-hosting rock body in the Duobaoshan copper deposit, we have conducted study on the emplacement depth of the ore-hosting granodiorite porphyry body using hornblende-plagioclase geothermobarometer.The results show that the ore-hosting granodiorite porphyry body has the diagenetic pressure of 1.69×10⁸~1.78×10⁸ Pa, the diagenetic temperature of 650~710℃ and the emplacement depth of 6.36~6.69 km, this is of great significance for studying the depth and rate of exhumation, evolution stage, and tectonic environment of this deposit.