By simulating the structure of tuna body, the swing part of vibrator wa s designed as the shape of flexible trailing vane,so the swing of the vibrator was more similar to the swing of the tuna′s caudal fin. Both the numerical calc ula tion and the laser scan experiment result indicate that the first mode of the co mpound beam has the minimum electromechanical conversion efficiency, while the second and the third modes have high efficiencies. The natural frequency and the mode shape were analyzed, and the later was well agreed with the result of the laser scan experiment. The relative differences between the simulation and the experi mental results at the resonant frequencies for the second and third vibration modes are 1.6％ and 0.3％, respectively. The prototype is manufactured and th e flow rate of the pump is tested. The result shows that when the vibrator works in the second order mode, the flow rate reaches 266 mL／min, and the resonant fr-equency is 740Hz; when the vibrator works in the third order mode, the flow ra t e reaches 105 mL／min, and the resonant frequency is 1 280 Hz. At the same ex citation voltage, the maximum flow rate of the pump is 160％ more than the simil ar type.