Abstract
Beijing-Tianjin-Tangshan- Qinhuangdao area structurally lies in the fault-fold belt before Yanshan orogenic belt. The geothermal springs are divided into two types: the natural outcrop type and the hidden artificial type of heat reservoir, the former of which is controlled by piedmont faulted , extending EW; while the latter of which is controlled by regional structure and geothermal field. Geothermal spring water is low salinity and neutral even low alkaline water, whose chemical type is mainly SO4•HCO3- Na and SO4•Cl•HCO3- Na. As the water is rich in fluoride and multiple heavy metals, it pollutes drinking water, soil, crops in different degree during the development and utilization. H2S and CO2 in the geothermal water also does harm to the atmosphere more or less.
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