Реферат: Hypogene karst is a special manifestation of karst development in spatial scale. Intensivestudy of its development mechanism has significant meaning for engineering construction, shalegas and geothermal exploitation. To reveal the developing pattern of hypogene karst in Huanjiangsyncline, karst groundwater at different depths in wells HD1-2 and HD1-4 and karst springs wasselected as the research object. Through the analysis of geochemistry and stable isotopes of karstgroundwater, it was revealed that the circulation pattern of deep karst water came from the commonrecharge of meteoric water and fossil water hosted in karst caves, runoff of deep faulting belts anddischarge of large karst springs, over Huanjiang syncline, which provides good hydrodynamicconditions for hypogene karst development. Meanwhile, the widely developed faulting belts andstructural fissures provide primitive dissolution space. Through the above analysis, the paperconstructs a hypogene karst development pattern controlled by the deep cycle of groundwater inHuanjiang syncline