As medium of optical communication in the intelligent transportation system, LED light has wide application prospect. To ensure that the design of the visible light communication system has satisfactory performance, transmission characteristics of LED traffic lights in the communication channel should be fully understood, and construction of the channel model is a small cost and more flexible alternative means. The project of differential element is chosen to construct the channel model of direct link and reflection link, the impacts of typical weather condition, receiver position, transmission distance and different reflective pavement on systematic transmission performance are analyzed. Simulation results show that the effects of asphalt and water surface reflectance on the experimental result can be ignored in the channel modeling, while the impact of ice and snow road surface diffuse on reception should be considered; the closer the distance between car and light source is, the stronger the received signal is; at the same time, it is verified that the received signal is the best when the receiver is installed on the top of the car.