The groundwater recharge for geothermal field is a new technology to realize the geothermal energy resources sustainable development, solve the geothermal energy supply and improve the utilization efficiency of geothermal energy. The technical method is implemented by a water injection well constructed at a certain distance from the exploiting well, by exchange of certain proportion water injected to underground through injection well and the heat source to improve the heat resource. This paper introduces a new technology to increase the geothermal well injection by fracturing the water into injection well. By hydraulic fracturing and pumping tests, obvious effect of water injection increase is obtained, which provides a new technical method for reasonable exploitation and protection of geothermal energy resources for China.