Objectives:The Dahongshan Group located in the western part of Yangtze Block is the stratigraphic unit with relatively highgrade metamorphism and older formational age. In this paper, we regard the intrusions which intruded the Daohongshan Group and the metavolcanic rocks in the top of Hongshan Formation as study objectives,to confirm the diagenetic age of the Hongshan Formation and metamorphic age of the Dahongshan Group. Methods: LAICPMS UPb zircons dating. Results:The zircons from the garnet—biotite—albite schist、metagabbro（DFe1406）and quartz—albite porphyry are magmatic zircons. Analytic zircon data from three samples is concentrated distribution along the concordant curve. n(207Pb)/ n(206Pb) ages range from about 1.7 Ga to 1.5 Ga. However, The zircons from the metagabbro are metamorphic zircons n(207Pb)/ n(206Pb) ages range from about 0.8 Ga to 0.7 Ga. Conclusions:(1) constraint the diagenetic age of the Hongshan Formation in the middle of Da Hongshan Group at 1673 ~1643 Ma; (2) obtain the n(207Pb)/ n(206Pb) weighted mean age of 748.9 5.7 Ma of Ma metamorphic zircons selected from the metagabbro intruded the Hongshan Formation, indicating the Dahongshan Group undergone the metamorphism before about 750 Ma. we speculate that the metamorphism during 850 ~ 750 Ma of Dahongshan Group is probably related to magmatic events during the fragmentation of Rodinia supercontinent.