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 This paper is about illumination adjustment method and LED lighting of illumination control systems using a power line. The advantages of LED lighting compared with existing lighting can be briefly summarized as high-efficiency, long-life and eco-friendly. However, it is difficult to generalize because it is still expensive to replace the existing lighting. Illumination control methods and system of LED lighting can use the existing power lines with simplicity and low cost which is done in a way so that is basically used for lighting control signal transmission phase control of the power to use alternating current switching element (Triac). The existing incandescent lamp dimmer is required for continuous phase control of power to control the rate of power transmission for illumination. Ongoing of phase control will supply power not suitable to the input of the LED lighting power supply. Thus, the phase control of the power is temporarily used only for inputting control information of the LED lighting connected to the lower power is advantageous. It is designed to transmit control information in a half cycle using a high-speed power cutoff function of the alternating current switching element. It is detected by lighting power supply apparatus power shutdown instantaneously which is inserted into the half-cycle; it is converted to the magnitude of the output current. LED lighting does not have a large amount of data. In this study, it is intended to present the illumination control method using the alternating current switching device with the power line.