1�� College of Resources and Environmental Science��Jilin Agricultural University��Changchun��130118��China; 2�� Research Center of Paleontology and Stratigraphy��Jilin University��Changchun 130026��China

The original temperatures of different aged granites in eastern Great Xing'an Range have been obtained by the calculation of the zircon saturation temperatures of the granites��which provided important information for discussing the forming condition and tectonic setting of the granites�� The results showed that Early Paleozoic granites��Late Paleozoic I type ( �� 300 Ma) and A type ( 260 �� 290 Ma) granites belonged to high temperature granites��the formation of high heat was related to asthenosphere upwelling or lower intrude action of sourcemantle caused by extensional background after orogenic activity�� Late Paleozoic I type granites ( �� 300 Ma) and Jurassic granites both belonging to low temperature granites��probably show an tectonic setting associated with subduction and fluids participation�� The zircon saturation temperatures of Cretaceous I type granites as the same as the Jurassic's��belonging to low temperature granites��and its formation was probably related to fluids participation�� which maybe came from the relict of ancient Pacific Ocean subductive plate�� Cretaceous A type granites belonging to high temperature granites��and the formation of high heat might be related to the lower intrude action of sourcemantle�� formed by lithosphere reduction in Cretaceous extensional tectonic framework��