Abstract：
Geothermal heat pump system is used as air-conditioning cold/heat source in an office building in Changping Science and Technology Park of Beijing. 320 underground heat exchangers are set and drilling depth for buried-hole construction is 120 m. Considering the special and complicated geological conditions, drilling construction process of hole guiding plus tube following is adopted to strengthen the control on critical construction processes and to ensure successful installation of underground heat exchanger.
