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A series of tests were conducted in a laboratory to improve cavitation monitoring techniques. The best run condition together with the cavitation at the same rotary speed-dropping flow rate and same rotary speed-flow rate were simulated on this test-bed. Moreover, the inlet water sound and enclosure vibration signal of the pump were acquired. The results of the cavitation experimental study showed that pumps NPSH3 was increased by flow rate at 100, 110, 120m3/h; the inlet water sound and enclosure vibration signal of pump were followed uniformity by sound pressure rule; according to the distribution of experimental data points and NPSH3 distinguishable curve，as well as sound pressure curve, the range of lift declined 3% which was regarded as inceptive cavitation that used in project was near the pressure energy maximal position; pump cavitation real time monitoring was carried through sound pressure curve peak value and 3σprinciple.