In order to ensure the sustainable development and utilization of geothermal resources,it is of great concern in the field of geothermal to carry out in-depth research on reasonabledistance between production and reinjection wells.wells in recharge engineering and prevent thermal breakthrough in a short time.Based on the temperature measurement results of the whole well,the variation characteristics of geothermal field in different mining and irrigation projects of sandstone heat storage are analyzed in this paper.The results show that with the increase of recharge years,the range of cold water becomes larger,the effective recharge path of heat to the recharge well becomes longer,and the fluctuation range of the temperature curve of the heat reservoir of the recharge well becomes smaller.When the distance between the production and irrigation Wells is small and the bottom temperature is relatively low,the recharge cold water will affect the production Wells, resulting in the decrease of the heat storage temperature of the production Wells.Heat convection plays a leading role in heat recovery at the initial stage of recharge,and with the increase of recharge years,cold water range becomes larger,the effect of heat convection on the recovery of temperature field is weakened gradually;Meanwhile,The heat conduction of the surrounding and adjacent impervious layers plays an increasingly significant role in temperature recovery,and the temperature recovery becomes slower,therefore,under the condition of large-scale recharge,thermal breakthrough is inevitable.