To further elucidate the multi- stage uranium metallogenic mechanism of the Motianling area in northern Guangxi, we studied the characteristics of mineralization and alteration, uranium occurrences and the mineralogical geochemistry of pitchblende, pyrite, and chlorite in two typical uranium deposits (Daliang and Xincun) using optical microscopy, scanning electron microscopy (SEM), and electron microprobe analysis (EMPA). The results show that the uranium minerals in the uranium- chlorite (pyrite) type ores from the Daliang deposit are mainly composed of uraninite, brannerite, and a minor amount of phosphoric uraninite. In contrast, the uranium occurrence of the Xincun deposit is relatively simple, dominated by uraninite with minor coffinite. Geochemical analysis shows that the uraninite from the Daliang deposit is relatively enriched in Pb and REEs, while the associated pyrite shows elevated As content. In comparison, the uraninite from the Xinchun deposit is enriched in W and Ca. These geochemical signatures suggest that the two types of uranium mineralization in the Motianling area formed in a medium- to low- temperature environment, with the granite itself or adjacent strata potentially providing abundant ore material for the formation of uranium mineralization. Based on the chlorite geothermometer, the mineralization temperature of the Daliang ore deposit is estimated to be 218~243℃, consistent with homogenization temperatures obtained from fluid inclusions, further supporting a medium- to low- temperature environment. Pre- ore chlorite in the Xincun deposit formed at temperatures ranging from 219~243℃, significantly higher than the mineralization- stage homogenization temperature of fluid inclusions. The formation mechanisms of chlorite include dissolution- crystallization and dissolution- migration- crystallization processes.