Abstract: The vertical and horizontal vibration data of five water pump units were collected by two magnetoelectric transducers at seven test points and then the analysis of the time dom,amplitude,spectrum,correlation and cepstrum were carried out.The results showed that the electric motor′s vibration caused by its rotation was transmitted to the water pump unit through rigid coupling,which resulted in the bear wear and tear severely because of the acute vibration of the water pump unit.The vibration of water inlet was higher than that of water outlet. Electrom agnetic noise of high frequency were found in all five water pump unit. The paper also put for ward some measures to reduce the vibration of the water pump unit.