In order to seek the characteristics and rules of cavitation in centrifugal pump, a sound pressure method and a vibratory approach are jointly employed. The high frequency radiated noise and the vibration of the pump body, caused by cavitation in the centrifugal pump, are captured by hydrophone and acceleration transducer under laboratorial condition. Results show that the energy distribution of the submarine sound signal and vibration signal above 5 kHz has a variation trendy of ″first step up then go down″ before and after cavitation, and the submarine sound signal, which is more sensitive to cavitation, has obvious peak values in frequency band of 8～12 kHz． Ｂoth the bispectrum of the submarine sound signal and vibration signal have a marked difference before and after cavitation,the characteristics of the bispectrum above 5 kHz are used as a reference for online cavitation monitoring or offline detection in centrifugal pump.