In the study of indoor visible light communication,the topology of LEDs is usually ignored,and most of them are regarded as a fixed parameter.Aiming at the topology problem,this paper proposes the simulation analysis of different LED topologies,establishes the indoor visible light communication system model through Matlab,and simulates the LED topology in indoor visible light communication,and obtains different LED topology.The indoor reception signal-to-noise ratio distribution is used to analyze the influence of different LED topologies on signal transmission.The simulation results show that the influence of LED on the indoor signal-to-noise ratio is mainly determined by the uniformity of the structure distribution and the illumination intensity of the LED,and the optimized LED topology has a better indoor SNR distribution,which is more suitable for indoor visible light communication.