A light-emitting diode (LED) string is provided. The LED string includes a power plug configured for connecting with a power source to power the LED string; one or more LED sockets configured for electrically connecting with the power plug; one or more LEDs configured for being installed on and electrically connecting with the LED sockets; and a control module configured for being electrically connected with anyone of the LED sockets. The control module includes a control circuit, an input terminal and an output terminal, the control circuit electrically connects with one of the LED sockets via the input terminal and the output terminal and controls a current flowing through the LED string to change from a first value to a second value, thereby controlling the LED string to light.