As the crystalline basement of the south Qiangtang terrane, the metamorphic rocks from Jitang Group in the North Lancang River suture contain rich geological information, but the inversion of its internal tectonic thermal event records needs to be further deepened. Systematic zircon U-Pb chronology study was carried out on the gneiss from Jitang Group. The results show that there are mainly three groups of magmatic detrital zircon age peaks (980~920 Ma, 780~740 Ma and 570~520 Ma), one group of magmatic zircon age peaks (230~200 Ma) and one group of metamorphic zircon age peaks (120~80 Ma) in the gneiss. Among them, the age of magmatic detrital zircons from old to new corresponds to the convergence and breakup of the Rodinia supercontinent in the Grenville-Jinning movement and Pan-African orogeny, suggesting that the south Qiangtang terrane was an important part of Gondwana continent in the Meso-Neoproterozoic. Magmatic zircons in late Triassic are the response of the regional magmatic activity induced by slab break-off of Longmucuo-Shuanghu-Lancang River Tethys subduction toward the north and northeast. Metamorphic zircons in late Cretaceous record the anatexis of the thickened crust in the Bangong-Nujiang suture under syn-collisional setting. In addition, the ancient detrital zircons age (2500~2100 Ma) sporadically distributed confirms that there are Paleoproterozoic or even older crustal materials in the source area of metamorphic rocks from Jitang Group.