Abstarct: Bahabad is located in Yazd province, 80 kilometers far from Bafgh city. In this research with the aim of simulating Bahabad aquifer using GMS and predicting groundwater table fluctuations at the five next years, management scenarios for improving aquifer conditions were studied. The model was calibrated for a stress period of one month (October 2008) in steady state, and also for a period of one year (April to March 2010) in unsteady state, considering four stress periods and twelve time steps. Model sensitivity analysis indicates the maximum sensitivity of hydraulic conductivity. At the end of calibration process, the optimized values of hydraulic conductivity and specific yield were determined as 0.006-35.5 m/day and 0.01-0.095, respectively. The model was verified and validated using data for a period of three years from April 2012 to March 2015. Prediction of aquifer conditions at the following years (April 2015 to March 2021) indicate water table will highly decline (about 2.3 m), especially in areas with focus of discharging wells, as the current withdraw from aquifer will be continued. Investigating different scenarios related to climate change and aquifer management confirmed the rule of control of aquifer discharge in water table fluctuation. Change in rainfall has no more effect on the aquifer water budget and water table fluctuations, as the direct recharge into the aquifer is low. Scenario of reducing discharge by the wells to permitted values shows significant impacts on water table changes, but aquifer budget still remains negative. baxsed on modeling results, in order to balance the Bahabad aquifer, total withdraws must be decreased to 8.58*106 m3/year.