They have broadened in application in these areas . there are some research works on gshp having been done in our country since last century 80 ' s . the research works were concentrated on feasibility of gshp and modeling of borehole heat exchanger on small experimental systems 我国自上世纪80年代末开始也相继开展研究，但至今仍停留在局部地区的小型实验系统的研究层面上，研究也主要集中在技术可行性分析及埋地换热器模型建立等方面。
