Reducing the consumption of energy for the circulation of a heat exchange medium, of course, part geothermal exchange of the double pipe structure buried in the ground for switching, the heat exchange medium so that it is possible to reduce the burden of the construction, management and maintenance costs to the available state and comprising the aforementioned smelting via the user sobicheo collecting the heat exchange medium is transferred to the heat conditions in the transferring unit and then media collection unit for the geothermal exchange part cycle back and a plurality of circular paths, spaced apart in said medium collecting unit up and down two stage , further comprising a first and a second store arranged, provided with a raised pump on a first circulation path between the first and second stores, and the second storage the higher place than the first storage, the geothermal provides a heat exchange unit underground system characterized in that the heat exchange efficiency can increase the contact area or the contact time between the stretched and geothermal heat exchange medium.