The present invention provides a touch panel, including a touch-sensing circuit, an ESD protection circuit, and a processor. The touch-sensing circuit is composed of a plurality of sensing pads for sensing at least one touching object and outputting a sensing signal. The ESD protection circuit is connected to the touch-sensing circuit, surrounds the touch sensing circuit, and generates a circuit-loading. The processor is coupled to the touch sensing circuit and the ESD protection circuit to receive the sensing signal and the circuit-loading, performs an action according to the sensing signal, and determines whether to generate a warning signal according to a circuit-load change.