Abstract：In the region of the west route of South-to-North Water Transfer Project in China，the topographical，geological and climatic conditions are very complicated and the field investigations are also very difficult to be performed. With the consideration of the above reasons and limit research time，an integrated evaluation method is developed to study the related hydrogeological conditions of the region，in which the remote sensing technique is mainly adopted with combination of field ground surface investigation，environmental isotope research，field data analysis of borehole water pressure test and isotope trace test，hydrogeochemical analysis of groundwater from springs，and numerical modeling，etc.. The hydrogeological conditions of west route region in the South-to-North Water Transfer Project are also studied，such as the major types of groundwater and the geochemical properties，the spatial distribution of main aquifers，the main hydrogeological elements and the relations among supply- runoff-drainage，groundwater movement，etc.. There are two main aquifers in the region：the pore aquifer and the weathered fracture aquifer with a large groundwater runoff intensity caused by physical weathering process. It is the basic hydrological characteristics that there is an active deep groundwater cycle through tectonic fractures and faults with rich water storage. Considering the application to the hydraulic engineering，the hydrogeological parameters are also investigated. The possible water quantities flowing into tunnel are finally studied；and the possible hydrogeological problems of the engineering are presented. The water flow from rock mass into tunnel will be the main hydrogeological problem. The research also provides a new way to evaluate the hydrogeological conditions for the region covered by high mountains.
