Abstract: Xiangshan uranium more-field is a famous hydrothermal uranium ore-field. It occurs in the fossil hydrothermal systems within Xiangshan Mesozoic volcanic basin and is the product of water-rock interactions in the hydrothermal systems. Therefore, the reconstruction of the paleohydrogeological setting is of great importance to genetical study of the mineralizations and to the prospecting for the deposits. Based on field geology, tectonic evolution history and paleo-climate condition, after the paleohydrogeological stages and zonation were defined in this paper, the recharge, discharge zones and movement of the paleo-groundwater were analyzed, and then the formation condition of the hydrothermal systems was discussed. TWO ore-forming hydrothermal systems in Xiangshan ore-field have been recognized by means of tectonopaleohydrogeological analysis. One is the north hydrothermal system which produced the sodium-metasomatic type Uranium deposits, and the other is the west hydrothermal system which yielded the fluorite-hydromica type uranium deposits. According to hydrogen and oxygen stable isotope studies, fluids of the hydrothermal systems as considered to have been derived mainly from meteoric water. Modeling of the paleogethermal field shows that the heat for Xiangshan hydrothermal system was derived mainly by ground water circulation to deep levels in a relatively higher geothermal gradient.