Abstarct: Dehgah and Khorkhori karst springs are situated about 20 kilometers south west of Bojnord and south of the Badranlo. Karst springs aquifers mainly composed of Tirgan limestone. To investigate the hydraulic connection in-between Khorkhori, Syedli and Dehgah Karst springs, physical and chemical parameters of discharging water from springs has been monitored for 13 months. Lower variances of the discharge, Electrical Conductivity (EC) and main ions, one recession slope of the karst springs of the study area and low development karstification features in the study area indicates a dominance of conduit - diffuse conduit flow in the study area. In this research springs catchment area delineated in preliminary basis. In delineated catchment of spring the average amount of precipitation baxsed on the precipitation- elevation relation of neighboring stations with some corrections anticipated around 498 mm on annual basis. Regarding to the field observations and evaluation of soil cover percentile, development of the solutional structures and other karst geomorphologic features the amount of recharge in the study area were estimated to be 43% of the precipitation on annual scale. The preliminary annual amount of recharges evaluated using the precipitation amount and recharge fraction which is 3.2, 1.8 and 3 million m3 for Khorkhori, Syedli and Dehgah karst springs respectively. Calculated annual volume of discharges from Khorkhori, Syedli and Dehgah karst springs using springs hydrograph are 3, 1.8 and 5 million m3 respectively. Comparison of the estimated recharge volume and calculated discharges in Khorkhori and Syedli karst springs shows a 7% of proportional error. Such negligible error indicates an appropriate precision of the catchment delineation and the delineated area may be considered as springs catchments. Significant difference between the calculated volume of recharge and discharging volume from Dehgah karst spring may be interpreted in this way: since the delineated preliminary catchment of Dehgah spring is situated in southern parts is limited by Khorkhori and Syedli catchments and in Northern part is limited by mountainous part and from the physiographic and hydrologic points of the view there is no possibility for correction of the catchment and increasing the delineated area so it could be concluded that there is a hydraulic connection between Khorkhori and Syedli with Dehgah and some portion of the discharging water from Khorkhori and Syedli which are situated in upstream of the Dehgah, after penetration in river bed materials remerge in Dehgah spring.