Abstarct: The study area is Ghaemshahr – Jooybar aquifer which is located in the east of Mazandaram province with an area of about 614/24 square kilometers. In the north of this aquifer is Jooybar city and in the south of this aquifer is Ghaemshahr city. This aquifer is the most important source of drinking water and agriculture in these areas. Therefore, estimating groundwater recharge is necessary to evaluate and manage the aquifer. In this research in order to estimate the recharge rate in Ghaemshahr-Joybar aquifer, four methods of water - table fluctuations (WTF), chloride mass balance (CMB), water budget and isotope have been used. Examination of the aquifer hydrograph over a 12-year period shows a derensing trend that decreases by about 35 cm per year. The average annual recharge rate using WTF method was estimated at 148 million cubic meters. Chloride concentration in groundwater vary between 37.63 to 369.2 mg / l and its values in precipitation vary from 0.9 to 1.56 mg / l. The amount of recharge calculated using this method was estimated at a maximum of 16.23 million cubic meters, which due to the instability of chloride in the aquifer, its values were not used to estimate the total recharge of the aquifer. Water budget for the aquifer for the water year 95-96 was calculated. The amount of recharge using this method was estimated at 140 million cubic meters. The amount of recharge due to precipitation in the aquifer was estimated 48.5 to 49.75 million cubic meters by stable isotopes. In total, recharge estimation studies in the Ghaemshahr-Joybar aquifer show that rainfall and agricultural water return to the aquifer varies from about 140 to 148 million cubic meters per year. These values are calculated baxsed on the methods of water table fluctuations and water budget, which the similarity of the results obtained through these methods is a confirmation of the accuracy of the results. Therefore, the average recharge rate due to precipitation and return water in Ghaemshahr-Jooybar aquifer using water table fluctuation methods and water budget is equal to 144 million cubic meters per year. baxsed on the results, the average rate of rainfall recharge was estimated at 45 MCM/y which accounts for 11% at the precipitation.