Suspension system of a co-vibrating vector hydrophone need be designed carefully to reach the requirement of underwater acoustic measurement. Condition of vibration sensing of co-vibrating vector hydrophone is researched separately based on acoustic theory and mechanical vibration theory. A co-vibrating vector hydrophone with central fixed structure had been analyzed. The simplified model and equivalent circuit model of the proposed design were built for the analysis. The voltage response of the hydrophone to acoustic particle velocity is derived, and improvement of voltage sensitivity based on cymbal transducer is performed. Simulation result shows the design of vector hydrophone with central fixed structure can satisfied the requirements of acoustic measurement, and cymbal transducer can improve the response voltage sensitivity further.