In this paper, we studied experimentally on the running conditions of pump, when the pumping system falls in surging. We recorded the total head, discharge and motor imput by the oscillograph, and we obtained the closed curve which is described by the instantaneous points (H
p, Q) in the H
p (total head)-Q (discharge) plane. The results showed that (1) these closed curves were described in the direction of counter clock-wise, (2) the instantaneous discharge never attained to the negative range, (3) ΔH
p and ΔQ : that they are difference between maximum and minimum values, were less than those which were ever described by the other authors.
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