This paper discusses the source of the Early Cretaceous magmatic r oc k system and its relation to uranium mineralization in Yanshan—Guangfeng ar ea. In tectonic environment, the area was transitioned from the compressed and o ro genic tectonic environment in the early Mesozoic to tensile and extensional te ctonic environment in the Cenozoic. In late Mesozoic, transitional magmatic roc k geogeneration developed. The magmatic rock geogeneration of the early Early Cretaceous Shixi Formation (1 30~120 Ma) belongs to the alkali (rhyoli te)daciteandesitebasalt series. The rock assemblage of the late Early Cre taceous Zhoujiadian Formati on consists of acidic rocks (graniteporphyry) and basalt, belongs to a bimoda l ty pe of magmatic rock geogeneration, and they both belong to the syntectonic m ag ma system. There are certain relationship between the uranium deposits in Jiangxi Zhejiang tectonic volcanic rock belt and alkaline, less alkaline magmatic rock system wh ich is deepfocus and rich in potassium in this area. Its diagenesis and uraniu m mineralization is controlled by extensional tectonic system. The volcanic activ ity and subsequent hypabyssal and super hypabyssal porphyry body activity play a n important role in uranium mineralization.