Groundwater pump and re-injection in the same well is mainly applied in shallow geothermal development. For GSHP system, the proportion between pump well and re-injection wells is 1∶3~1∶6, for fine particle formation, it not only means more construction cost, but also means large site area, management inconvenience and difficult re-injection. According to the analysis and research, “pump and re-injection in the same well” system was designed according to the drilling theory and hydrogeology conditions, pump and re-injection in the same well was realized with satisfied effects. The paper explained “pump and re-injection in the same well” about equipment selection, well completion technology and application effect.