Abstract: With the development of sonar detect system's capacity and stability, vector hydrophone can co-locating and simultaneously measures pressure and particle velocity of acoustic field, it has been used in sonar detect system. In order to guarantee sea experiments, the tri-axial piezoelectric co-oscillation capsule vector hydrophone are designed and manufactured. According to comparison measurement principle, the sensitivities and directivities at the x, y, z and p gallery of the vector hydrophone in low and high frequency bands are measured in acoustic pipe and pool. The results of measurement indicate that the vector hydrophone's sensitivity and directivity meet the requirement of sea experiment.