Road lighting, lighting for the purpose of creating a motor vehicle drivers or pedestrians good visual environment, in order to achieve protection of traffic safety, improve transportation efficiency, reduce criminal activity and the effect of urban beautification night environment. The tunnel lighting than ordinary road lighting is much more important, in order to ensure the continuity of travel, both day and night lighting can not be separated at all times. In order to optimize the tunnel lighting project lighting design, it is necessary to first understand the basic characteristics of the tunnel lighting. 1, the road should have a certain level of brightness. 2, the tunnel walls should be a certain level of brightness. Many factors 3, the design speed, traffic volume, road alignment and so on. 4, from traffic safety and comfort levels and other aspects of the Integral lighting. 5, the human visual adaptation, especially the tunnel entrance, exit, etc. section. 6, tunnel lighting needs during the day, and day lighting problem is more complex than night. Overall, as a special section of the highway tunnel, and when the vehicle into, and exit through the tunnel in the process, there will be a series of visual problems, to adapt to changes in vision, set additional electro-optic lighting, and the importance of lighting in the tunnel lighting project becomes evident.