The invention provides a method and a system for controlling a smart television with analog keys, and a mobile terminal. The system for executing the method comprises a smart television and a mobile terminal provided with a touch screen. Network connection is established between the mobile terminal and the smart television in advance. The method comprises the following steps: an analog image including a plurality of analog control keys is displayed on the touch screen of the mobile terminal; when a touch event in the region range at which the analog image is located is received, the touched analog control key is determined according to the touch region of the analog image; the analog picture of the touched analog control key is enlarged and displayed according to the preset animation effect, and/or the color of the analog picture is changed; according to a preset analog control key and key key value comparison table, the key value corresponding to the touched analog control key is acquired; and the key value is sent to the smart television to execute the corresponding operation. According to the invention, through the above means, text information can be inputted conveniently and accurately.