Abstract: Exploitation situation of hot water well in Houhaoyao thermal field and the influence of exploitation of hot water well on water level, temperature, radon and mercury's dynamics in Huai 3 and Huai 4 wells are investigated in detail. The results demonstrate that the influence of exploitation of hot water from the same thermal layer on the underground fluid dynamics is serious. Such an influence is expressed in the dynamics of different observational items with different frequency in the time scale of several years, year, month and day, and it still exists more than one month after finishing the exploitation.

Key words: Underground fluid dynamics, Hot water well, Exploitation