There are two late Mesozoic volcanic rock belts with EW striking in Jiangxi Provinc and Northern Guangdong Provinc，called Xiajiang—Guangfeng volcanic rocks belt in the North and Sannan（Quannan, Dingnan and Longnan）— Xunwu volcanic rocks belt in the South，respectively．There are a little of the trachyte on Shixi Basin in Xiajiang— Guangfeng volcanic rocks belt and Sanbaishan Basin, Dachangsha Basin in Sannan—Xunwu volcanic rocks belt．The zircons of the trachyte have clear ring and high Th/U ratio which belong to the typical magmatic zircons.The Zircon SHRIMP UPb age of the Trachyte is 1370±094 Ma in Shixi Basin, 142±1 Ma in Sanbaishan Basin, 1354±15 Ma in Dachangsha Basin，which represent the diagenetic ages of volcanic rocks. On the latest International Stratigraphic Chart. the boundary of Jurassic and Cretaceous is 1454±40 Ma,the geological ages of the Trachytes in the Xiajiang—Guangfeng and Sannan—Xunwu Volcanic Belts are early Early Cretaceous．The large scale highK calcalkaline felsic volcanic activity and volcanic—granite uranium deposit related to alkali metasomstism uranium mineralization occurred in the early Early Cretacous inthe Xiajiang—Guangfeng and Sannan—Xunwu Volcanic Belts.The determination of the Early Cretacous trachytes show that highK calcalkaline felsic volcanic activity have connection with mantle magmatic activity and Alkali metasomstism. Uranium mineralization haveconsistent with the Alkali magmatic activity.