The Heluositan Rock Group (Complexes) is a kind of disordered metamorphic core complex, composed of migmatic granitic gneiss, hypersthene granulite, etc. Both of the rock association and geochemical characteristics have TTG rock features. By means of LA-ICP-MS U-Pb dating of the zircon from hypersthene granulite（1011AK PVI ZS2） in the Heluositan Complexes, an age of 3137.3±4.1Ma is determined, which should be the original rock age of the Heluositan Rock Group(Complexes), i.e. the Heluositan Rock Group(Complexes) is Mesoarchean. It proves that there is an Archean continental nucleus in Southern Tarim, which is one of the earliest rock series found in Xinjiang.