Abstract: The theory of bedrock groundwater has been developed based on the structural conditions along with the development of groundwater exploitation and further understanding of the occurrence and buried conditions of groundwater in mountainous region. Traditional hydrogeological mapping was based on the homogenity theory and the stratabound theory, it was not compatible with the mountainous hydrogeology development neither in guiding the bedrock groundwater exploration effectively. The system thinking and comprehensive application of hydrogeology, structural geology, cartography, GIS and other multidisciplinary knowledge were used in this study. By taking a typical hydrogeological unit in the Taihang Mountain as the research object, the drawing method of mountainous hydrogeology was developed based on the nonuniform ditribution of bedrock groundwater, combination of field investigation and laboratory processing, teamwork and experts[JP8]’i[JP]ndependent thinking, computer cartography and information mining so as to determine the practical and conceptual patterns of mountainous hydrogeological maps. The map of mountainous hydrogeology obtained in this study could be used to explain the occurrence regularity and characteristics of mountaionous groundwater, judge the waterrich belt, provide the basic and guiding information for mountainous hydrogeological mapping, expand the conceptual basis and application space, and serve the national construction.

Key words: mountainous hydrogeological map, bedrock groundwater, nonuniformity, mapping principle, mapping method, the Taihang Mountain