Abstract: Simulation and analysis on dynamic behavior of resonant cylinder which composed the pressure sensor as the elastic component are conducted using the finite element analysis software ANSYS．Parametric model is established．Based on the modal analysis，an appropriate mode for work is selected out．Factors affecting quality factor are discussed mainly through harmonic response analysis．Results indicate that，when the cylinder worked on ( 4，1) mode，quality factor would decreases as radius，effective length or thickness increase，while the force only had an influence on the amplitude of the vibration rather than the quality factor．Adjusting time is obtained by transient dynamic analysis，thus proving the rapidity of resonant cylinder．The study provides reference both for structure design and optimization．