In order to further refine the fuel atomization particle size, a gasoline nozzle was designed based on the onedimensional vibration theory. The vibration modal and harmonic responses were analyzed with the finite element method to obtain the resonant frequency and the frequency of vibration displacement and stress distribution, the theoretic frequency of 30.157 kHz was nearly equal to the measured frequency of 30.862 kHz of the HP4286A LCR precision impedance instrument. Furthermore, theoretical analysis and experimental research for the nozzle atomization effect of gasoline were done, theoretical calculation of particle size of 24.38 μm were basically consistent with the measured particle size of 27.62 μm, the size was reduced about 2 times compared with the size (about 50 μm) of traditional gasoline injector. The results show that the device can effectively improve the atomization quality and fuel efficiency of gasoline, and provide technical reference for the design of the engine fuel injector.