Abstract: For low-noise design of the piezoelectric vector sensors, an equivalent self-noise analysis model of co-vibrating vector sensor system was established which including piezoelectric accelerometer, suspension structure, pre-amplifier and cables. A low-noise design method was proposed combining the low-noise design of the piezoelectric accelerometcr, the influence of the suspension structure on self-noise, and the low-noise matching of pre-amplifier with piezoelectric accelerometer together. A low-noise vector sensor prototype was designed and fabricated, a self-noise measurement platform was developed as well. The prototype was measured in the platform. The equivalent noise pressure level of the prototype reached 55.5 dB/√Hz@200 Hz, which was lower than the Knudsen ambient noise level of Sea State 0 (SS0). Tile experiment results were well in agreement with prediction, which showed that the design method was valid, and provided a theoretical basis for low noise design of piezoelectric vector sensor.