The Piaotang tungsten deposit is in a well- known tungsten –tin (Mo, Bi) ore–foming district in southern Jiangxi, China. The deposit consists of Piaotang , Muziyuan and Dalongshan blocks. Little work has been done on the ages of ore-formation and related granite in Piaotang for a long time. In this paper, the ages of intrusion of the Piaotang and Muziyuan granites are reported by means of the single grain－zircon U-Pb isotopic method, which are 161.8±1Ma and 153.3±1. 9Ma, respectively. The age of ore –formation for Muziyuan block is determined as 151.1±8.5 Ma ( N=6,MSWD=11.8) by means the molybdenite Re-Os isotopic method. An ore-forming age of 152±10Ma for Piaotang block is also determined by using the quick neutron mobilization 40Ar/39Ar age method of mica from the major ore vein. All these age data indicate that the granite intrusion and related mineralization occurred at the same time or several m.y. apart. These are two common and representative cases for the granite-related tungsten-rare-metal deposits in southern Jiangxi such as the well-known Dajishan tungsten deposit and Taoxikeng tungsten deposit . Data of the paper and ages reported for last year show that the tungsten – tin deposits in Southern Jiangxi Provice belongs to the results of large- scale granitic magmatism and the associated rare-metal minarelization in the middle Yanshanian period of the Mesozoic Era.