Abstract: The electric neutral sheet metal inhaled into the capacitor vibrates by the attraction of capacitor＇ s electric charges. The problems discussed here are follows： vibratory rule of sheet metal with or without damping; function convertion in movement that electric field force makes speed up or down of sheet metal; electric quantity or voltage of the capacitor remain unchanged energy storage keep changed in sheet metal vibratory process; the power source to supply capacitor＇ s energy in each sheet metal vibrating cycle ; the periodical change of capacitor voltage, electric quantity and other parameters.

Key words: capacitor, inhaling sheet metal, vibration, functional relationships