The present invention provides a location supporting plate of the loudspeaker, also named as a center suspension or an elasticity wave, in particular a thin loudspeaker location supporting plate structure. According to the design of the invention, the section of the location supporting plate shows a wave shape, a center hole is mounted in the center of the location supporting plate, each wave comprises a wave trough and a peak respectively, and the height of the peak is higher than the height of the wave; a projecting platform is composed of one peak, or two more peaks having similar or same heights; the projecting platform at least has two; and height of the projecting platform near the center is higher than the heights of the rest projecting platforms. The location supporting plate of the loudspeaker employs a multiple projecting platforms structure, especially fit for audio pattern design of plate video devices such as LCD, PDP and the like. The invention improves the compliance ofthe location supporting plate or the whole loudspeaker vibration system, thereby effectively reducing the resonant frequency of the loudspeaker, improving the low frequency response.