The present study intends to estimate the surface runoff and groundwaterrecharge in Lialan basin using the soil conservation service method (curve number)and chloride mass balance method (CMB) respectively. Lialan basin is located at thesoutheast part of Kirkuk governorate, between longitudes (44° 21' 00" E - 44° 42'00" E) and latitudes (35° 7' 30" N - 35° 28' 30" N) , which covering an area of about436 km2 and contains many geological formations. In this study, based on theannual rainfall data extending from (1970 - 2016) obtained from the Kirkukmeteorological station, the surface runoff was calculated using the curve numbermethod (CN), and found to be equal to 90.4 mm/year, which represent 26.07 % ofthe total rainfall. While the groundwater recharge was calculated depending on theannual rainfall and chloride concentrations in rainfall and groundwater using thechloride mass balance method (CMB) and found it equals 23.07 mm/year,representing 7.42 % of the total rainfall. Thus the annual recharge amount for thewhole basin is equal to 10.0585 × 106 m3 / year. Generally, the results indicate adirect relationship between the systems of runoff and groundwater recharge inLialan basin with total rainfall .