A docking station for notebook computers includes a connection module, a detection module, a connection port and a signal-processing module. When coupling of a notebook computer and the docking station is detected, an activation signal is generated to activate the signal-processing module to process video/audio signals input to the docking station. The processed video/audio signals are output to the notebook computer to enable users to enjoy video/audio programs on the hardware facilities of the notebook computer thereby to expand the function of the docking station.