Embodiments of the present invention disclose an electronic device control method and system, and a related device. In the method, a mobile terminal reads an application content identifier included in an application that is stored in an electronic device, outputs the application content identifier included in the application, and outputs, after a first selection operation on an output target application content identifier included in the application is detected, a control option list matching the target application content identifier; and on such a basis, the mobile terminal may detect a second selection operation on any one of content control options included in the control option list, and transmit, by using a wireless link, a content control instruction matching a chosen content control option to the electronic device, so as to trigger the electronic device to perform, by using the application, a control operation on application content to which the target application content identifier belongs. During implementation of the embodiments of the present invention, application content included in an application can be effectively controlled in a case where an electronic device is far away.