Qingzhangshan (Longyuanba) pluton, located between the Zhuguang and the Guidong granitic complexes that are two of the most important granitetype uranium concentration areas in South China, is a poorly investigated area in the study of granitetype uranium deposits. Jiangtou uranium mining area is located in overlap region of the northern part of the Qingzhangshan pluton and the Nanxiong fault basin. Till date, the chronology of the uranium deposits remains unknown. The micromineralogical characteristics of uranium in this area have been studied by means of electron microprobe. At the same time, the UThPb chemical ages of magmatic crystalline uraninite and hydrothermal pitchblende have been calculated, and the dynamic background of uranium mineralization and oreformation has been discussed. Results show that the uranium minerals in the coarsegrained porphyritic biotite granite and mediumgrained porphyritic biotite granite are mainly uraninite and coffinite and some uraninite show obvious characteristics of uranium release. The chemical ages of uraninite are 246. 8±8. 8 Ma and 161. 5±8. 0 Ma which are consistent with the range of previous zircon UPb ages, representing the diagenetic ages of the Indosinian and the Yanshanian granites respectively. It shows that before the formation of Nanxiong fault basin, the Qingzhangshan pluton and the Zhuguang pluton were an organic whole with the same diagenetic and metallogenic environment. The uranium minerals in the ore of the Jiangtou mining area are mainly disseminated pitchblende accompanied by a small amount of brannerite, coffinite, etc. The chemical ages of pitchblende are 121. 3±9. 8 Ma, 98. 8±8. 0 Ma and 73. 2±8. 8 Ma, representing ages of three stages of uranium metallogenesis in this area. Combined with the six tectonic extensional movements since the Mesozoic, it had been considered that uranium mineralization in this area is controlled by dual factors: metallogenic dynamic background of deep fault depression activity in the margin of MesozoicCenozoic basins, and the distribution of uraniumproducing granite bodies. The Qingzhangshan pluton should have similar prospecting prospects as the Zhuguang and the Guidong plutons.