Abstarct: The Shahoo karstic mountains are located in south of Kurdestan province and north of Kermanshah province. These mountains have prepared appropriate conditions for developing the karst features in this region of High Zagros with having a suitable limestone reservoir rock and relatively high precipitation. In this research it is tried to study the hydrogeological and hydrogeochemical characteristics of Taloksan, Ghalvaz and Ravansar springs along with the structural characteristics of catchments of Ravansar, Shakhalaedin, Sarhoz and Taloksan springs and their effect on groundwater flow. According to the obtained results the variability of physico-chemical parameters particularly spring discharge is very high. Such that the variation coefficient of spring discharge for Taloksan, Ghalvaz and Ravansar is 88/34, 6/54 and 5/122, respectively. Such results indicate that the predominate karst flow system is conduit type. Moreover, both hydrogeological and structural studies indicate that the karstification in the catchments area of Ravansar is relatively less than the other sprigs and mostly concentrated along the major tectonic features. The obtained results of studying the fractures shows that in the almost all cases, their average apertures is higher than 30 mm which indicate the important role of fractures in infiltration of water into karst aquifer. In addition the average length of studied fractures in most cases is greater than 40 m which is important for conducting the water to karst aquifer.