Abstarct: The studied region is located at 8 kilometer of west Mojen in the south of Mojen waterfall, a part of the Shahrood county. In order to study the hydrogeological and hydrogeochemical characteristics of springs, discharge, electrical conductivity and temperature were measured from October 2017 to November 2018. Due to negligible changes in electrical conductivity, ions concentration were analysed in two periods (June and October 2018). The obtained results showed that the coefficients of variations for the physical and chemical characteristics of springs are relatively negligible. The negligible coefficients of variations of discharge, electrical conductivity and water temperature confirm the dominant diffuse flow system in the study area. In addition to the negligible temporal variations in above mentioned, the non-exsistance of morphological features which indicating the developed of karst, such as closed depressions, sinkholes and poljes, also confirm dominant diffuse flow system in the region. Recession curve of the studied springs has solely one coefficient of discharge (α) with a gradient of 0.009 which indicates the dominant diffuse flow system in that karstic aquifer. One of the main reasons for the emergence of the springs in the studied region is contact of groundwater in the karstic catchment of these springs (Limestone rock formations of the Cretaceous and Lar) with impervious units (marls and marly limestone). According to the springs of the area are overflow springs. Also in this research, the primary catchment area of the springs was drawed. Then precision of this primary catchment area was evaluated by the water budget method and comparing its values of annual discharge and recharge volumes. According to the mentioned comparison a relative error of 0.8 percent was obtained. Due to the negligible relative error between annually recharge and discharge volumes and the location of different rock units in the region, the drawn catchment area is quite accurate.