Abstract:Allanite is a common accessory mineral, which is an important carrier of LREE, Th, U,Sr and other trace elements in rocks. Th, U can be enriched in allanite lattice in the form of isomorphism,so allanite is a good geochronological tool. However,the variable incorporation of common lead in allanite makes it difficult to subtract the common Pb, which limits the application of allanite U-Th-Pb dating. In this paper, procedures have been developed to analyze the allanite from Guangdong Xinfeng rare earth element granite by laser ablation ICP-MS. 232Th/206Pbc—208Pb/206Pbc isochron assumes age, and then common Pb correction is used according to the lead isotopic evolution of the two-stage mode. Using this method, the allanite Th-Pb age of Guangdong Xinfeng rare earth granite has been dated to be of ~160Ma, which is very similar to 159Ma ~ 165Ma as dated by magmatic zircon U-Pb dating method. Trace elements, δEu, Th/U ratio and common lead content of allanite indicate the magmatic origin. Allanite dating is the first time used in China. The dating method is simple, convenient and accurate for determination the age of the rocks containing allanite. The method may play an important role in geochronology, and has a very good and broad application prospect.