Due to water shortage under arid climate conditions in Africa, the effective balance of groundwater resources is extremely important. Based on the analysis of hydrogeological conditions of Zara Koka gold deposit areas, a quasi-three-dimensional finite difference groundwater flow model was developed to predict the influence of mine water supply on the drawdown of groundwater level under the three climatic conditions of high water flow, low water flow and normal water flow during the mining and closure of Koka gold mine, and a comparative analysis was made on the degradation of groundwater level with and without mine water supply. The results show that the daily water supply is about 0.97×104 m3/a in the first 1 to 3 years, and the daily water supply is about 1.01 × 104 m3/a in 4 ~ 7 years. The mining of the mine water supply will not cause the local groundwater resources to dry up, and after the mine is closed, the aquifer water level will soon recover. Even under the most unfavorable conditions of simultaneous increase of mine water supply and dry river flow, the maximum groundwater level drawdown in the well site is 1 m to 1.2 m, and the groundwater level drawdown is only 0.2 m in the edge area 2 km from the center of the well site. The simulation results can provide scientific basis for the water supply of the mine in arid areas with high temperature.