The controlling method for a touch panel is disclosed. The controlling methods includes: executing a waking-up procedure to output a waking-up signal; comparing a measured value of the waking-up signal with a pre-determined threshold value; the touch panel staying in a power-saving mode if the measured value of the waking-up signal is smaller than the positive pre-determined threshold value or larger than the negative pre-determined threshold value; and the touch panel starting a detection procedure if the measured value of the waking-up signal is larger than the positive pre-determined threshold value or smaller than the negative default threshold.