At Sekigane Hot-Spring, Tottori, Japan, where three hot-springs place side by side, the auther measured the variation of spring temperature, pH, Cl,- HCO(3)- and SO (4)-- content and the amount of flow, during and after, pumping suction of one hot-spring. About the variation of other hot-spring, immediately after the commencement of suction, the content of HCO(3)- decreased and that of Cl- and SO(4)-- increased. Then the increase of HCO(3)- content and the decrease of Cl- and SO(4)--contents appeared with the lapse of time. After stopping the suction, these changes in contents were reversed agaln, that is, the decrease of HCO(3)- and the increage of Cl- and SO(4)-- were observed. Immediately after the second suction was begun, HCO(3)- increased and Cl- and SO(4)-- decreased rapidly. The amount of flow increased only when the pumping suction stopped. At the hot-spring which was pumped, HCO(3)- and SO(4)-- contents decreased and the slight increase was observed in Cl- content. Of cource, only when the suction stopped, the amount of flow decreased. But at these hot-springs, the ratio of Cl-/SO(4)-- has always constant value, about 1.05. These results show that these three hot-springs belong to the same line and difference was observed only in the contamination with ground-watres.