The traditional layout of light source based on array will inevitably lead to uneven illumination and BER in the room. In order to improve the illumination uniformity and reliability of the system, it is necessary to optimize the layout of the light source reasonably. In this paper, a 4m × 4m × 3 m room is used as the model to design a ring light source layout model with a single-LED array and lamp belts. In this model, the distance between the inner lamps of the 6 x 6 LED array is 0.3 m. The number of surrounding lamp beads is 316 and the distance between the lamps is 0.05 m. The simulation results show that the system illumination is about 437.08 lx and the illumination uniformity is 93.9%. At the same time, the system error rate is about 2.8716×10^-7.The annular light source layout model designed in this paper takes into account the uniformity of indoor illumination distribution and the reliability of communication simultaneously, which can meet the indoor lighting and communication at the same time and also can provide an optimization method for the layout of indoor visible light communication.