Abstarct: The study area is located in the north west of Shahrood city and 5 km north east of Tash village. One of the most important issues that has always been the cost and time of engineers in karstic aquifers studies is to identify the main flow paths and determine the dominant flow system in this type of aquifers. Methods to determine whether flow system in an aquifer is diffuse, conduit or something in between, are in most cases expensive and time consuming, presenting cheap and fast methods to quantify factors can be very useful in engineering projects. The purpose of this study is to identify the main groundwater flow routes in the karst aquifer north east of Tash village and to determine the dominant flow system in this aquifer. Structural studies on the geometry of faults and fractures in the region indicate that there is an important fault zone in the north east – south west direction in the region. In addition, it was observed that there is a set of sub-faults in the direction perpendicular to the main fault system trend (i.e. north east – south west trend) in the study area. The studied karst aquifer consists of dolomitic rock units and dolomitic limestone of Elika Formation. This karst aquifer is emptied by three karst springs named Ahar 1, 2 and 3. Flow rate, electrical conductivity and concentration of main ions in these springs were measured in the water year 1398-1399 and baxsed on the analysis of the obtained data, the hydrogeological and hydrogeochemical properties of this karstic aquifer have been evaluated. Studies conducted in the catchment area of the springs show that due to the dolomitic nature of the karst aquifer, karst development in the region is relatively small. It was also observed that the predominant flow system in the karst aquifer is diffuse. The combination of the results obtained from structural and hydrogeological studies indicates that the main groundwater flow paths have been formed in line with the structural elements of the region and affected by faults and joints. In this way, the groundwater flow in the karst aquifer is directed to the main fault by sub-faults and karst springs of the region have appeared in the place of the main fault.