Abstract: The Xiangshan area in central Jiangxi is an important producing base for uranium resources in China. Uranium mineralization occurs in the early Cretaceous volcanic intrusive complex, which is mainly composed of ignimbrite, rhyolitic porphyry, porphyroclastic lava, granite porphyry, dacite porphyry, lamprophyre and so on. Besides, a lot of cryptoexplosion relics-cryptoexplosive clastic rock occurs in the complex. The cryptoexplosion happened at the same time as or slightly later than volcanic intrusive complex activity. The relationship between cryptoexplosion and uranium mineralization events is a new research topic. In this article, based on field investigation and microscopic observation, along with cementation types, the cryptoexplosive clasolite is divided into two kinds, magma cryptoexplosive clasolite and hydrothermal cryptoexplosive clasolite, corresponding to magma cryptoexplosion and hydrothermal cryptoexplosion. The former refers to the cryptoexplosion occurring in the early of Early Cretaceous after the rhyolitic porphyry intrusion activities and cryptoexplosive intrusion activity of the porphyroclastic lava. The latter mainly refers to the hydrothermal cryptoexplosion after dacite porphyry intrusion activities, which is closely related to uranium mineralization in the late of early cretaceous or the early of late Cretaceous. From the early Cretaceous to early of Late Cretaceous, the cryptoexplosion presents a trend from weak, strong and to weak again. Uranium mineralization is related to hydrothermal cryptoexplosion in early of Late Cretaceous. The hydrothermal cryptoexplosion is synchronous with the uranium mineralization, which formed at 90 Ma and should be a sudden event.