Abstract: The Limu Sn-Nb-Ta ore deposit located in north Guangxi is an important component part of the Nanling W-Sn polymetallic belt. In this research, zircon SHRIMP U-Pb dating was conducted in Jinzhuyuan and Sangehuangniu area, and the resultant ages are 218.3±2.4Ma and 214.0±5.0Ma, respectively, which represent the formation age of the Limu granite. Combined with the previous research data, it is suggested that the formation of Limu granite and the mineralization occurred almost simultaneously, and that they should be the same magmatic products in Late Triassic.