In recent years, global water resources have faced major challenges due to population growth and the phenomenon of climate change, hence the need for proper and efficient management of these resources for sustainable development and the balancing of supply and demand over time is neccesary. The availability and proper knowledge of today's situation and the correct prediction of the future are necessary for this level of management. The present thesis examines results of the simultaneous occurrence of climate change and implementation of the plan for the restoration and balance of the groundwater resources of the country on groundwater resources in the Zayandeh Rud basin. Of the 9 GCM models under three scenarios RCP2.6, RCP4.5 and RCP8.5, the fifth report of the Intergovernmental Panel on Climate Change assessment was used to predict changes in precipitation and temperature variables between 2020 and 2049. Afterwards The models are then weighted with historical observational data based on their performance in the simulation of temperature and precipitation correlations between 1971 and 2005, based on ARCGIS software. Using the weight of models, coefficients have been calculated as a model of climate change for use in the LARS-WG weather generator. The outcomes of temperature and precipitation from LARS-WG reveal that the water basin experienced an annual increase of 16.16-1.26 mm precipitation and temperature range of 1.36-1.33 °C under different scenarios. This information is used as inputs of the HEC-HMS model to calculate runoff under 3 scenarios RCP2.6, RCP4.5 and RCP8.5 during the 15-year period of 2020-2034. Among the simulated runoffs, runoff under RCP4.5 scenario with a growth of 37 million cubic meters per year due to a lower increase than the rest of the runoff and more critical conditions relative to others as input runoff The WEAP management and planning model has been used. According to satisfied implementation of 5.7.9 and 10 instruction points in reclamation and balancing the country’s groundwater resources, respectively pertinent to purchase low productivity agricultural wells, the substitution of agricultural wells with prohibited plains wastewater, providing and installing the volumetric and intelligent water and electricity meter systems , notifications and designing a program for observation the well discharge, prevention of illegal wells harming the society, three trendy, optimistic and pessimistic scenarios are defined for the study area, three scenarios of trend, optimistic and pessimistic are defined for the present case study in order to investigate the implementation effect of this approach on groundwater resources using the WEAP model. The results of the mentioned scenarios among six major aquifers in water basin reveal that, the water fluctuation of the Buin-Miandasht and Isfahan-Borkhar aquifers has the maximum aquifer respectively along with a change of about 22 and 17.5 meters subjected to the optimistic scenario and the decreasing level in the trend scenario. The results in general survey of aquifers subjected to three scenarios indicate a 5 billion cubic meter compensation for aquifer reservoir in an optimistic scenario, the drop control and an increase of 1 billion cubic meters of reservoir volume in the pessimistic scenario and also the declining trend of water level and a decrease of water volume about 3.5 Billion cubic meters of in the aquifers of the Zayandehrood catchment area subjected to the trend scenario. Key words : Climate change, AR5, LARS-WG, Groundwater, Implementation, WEAP, Zayanderud Basin, HEC-HMS,