A system for setting a background image of a display module includes a housing. The housing defines a receiving space, a first hole and a second hole. The first hole and the second hole are communicated with the receiving space. The system further includes the display module received in the first hole, a transparent cover received in the second hole, a thermo-sensitive ink layer coated on the transparent cover, a camera positioned beneath the transparent cover, and a controller received in the receiving space. The camera is configured for capturing an image of the thermo-sensitive ink layer. The controller is configured for taking the image captured by the camera as the background image of the display module.