Abstract: In order to study the characteristics of the temperature field distribution in the enhanced geothermal system heat storage period,and the evaluation of system structure performance in the process of mining and utilization efficiency of the law of the change, based on the geological structure in Beijing activity detection results,and the differential control equations of the coupled for heat-fluid-solid processes,a two dimensional coupled model of natural crack-fault was proposed. The numerical simulation and analysis were carried out by using numerical software on the basis of the discrete fracture network model. Through different examples, a 12-year research of computing, the changes of rock-water temperature field caused by different water flow velocity and stratigraphic separation were analyzed. And the change of the temperature of different rock mass production from the water outlet and different fixed distance point with the time were summarized.