The embodiments of the present disclosure provide a method for controlling a smart terminal device and the smart terminal device thereof. The method comprises: monitoring a wearing state of receivers of an earphone connected to the smart terminal device, wherein the wearing state comprises a putting-on state and a taking-off state; and controlling running state of one or more applications in the smart terminal device and/or an operation mode of the smart terminal device according to the wearing state of the receivers. The embodiments of the present disclosure can simplify manual operations by monitoring the change of wearing state of an earphone. The lifetime of the mechanical members of the earphone can be improved, the electric energy of the smart terminal device can be saved, and no manual operation control is needed.