Visible light communication has a double function of illumination and communication, so it is needed to consider the light source layout and communication reliability issues. In order to ensure the international lighting standard, in the constant of the total LED lamp beads, firstly, the layout of the light source was analyzed, the illumination distribution and uniformity of the three and four array layouts under the same power consumption were numerically calculated. Secondly, in order to improve the effectiveness and reliability of multi-array visible-light communication system, MIMO technology was applied to VLC, and STBC coding was used to calculate the reliability of multi-array layout. The results show that the uniformity of illumination of the four arrays is 20.9% higher than that of the three arrays under the same power consumption. When the bit error rate is 10-4, the error performance of 4×1 system is improved by about 2 dB compared with the 3×1 system, the error performance of the 4×2 and 3×2 systems are increased by 6 dB and 5 dB compared with the 4×1 and 3×1 systems.