Abstract: A new structure of vibration sensor mainly comprising two metal conducting plates on its body, one of which is installed with an adjusting screw and the other with a fixing screw connecting to a vibrating spring which is connected to a hopper conductor at the other end. The adjusting screw is located in such a manner that its tip is in the middle of the hopper conductor, so that when the vibrating spring detects shock signals it causes contact between the hopper conductor and the adjusting screw.