In order to improve the performance of an outdoor light emitting diode(LED) visible light communication system and solve the interference problems caused by turbulence, such as phase change, beam drift and beam spread, etc., a LED visible light communication system based on multiple-input multiple-output(MIMO) technology was proposed. Firstly, the atmospheric turbulence channel model was constructed. Secondly, the model of LED visible light communication system was built based on MIMO technology. Finally, the original signal was recovered by maximum ratio merging method and bit error rate was calculated. The results show that, at the same turbulence intensity, the greater the diversity of the system, the lower the bit error rate. In the strong turbulent channel environment, the M=3, N=4 communication system achieves a bit error rate of 10-7. Compared with the M=1, N=1 communication system, the bit error rate is reduced by five orders of magnitude. This study verifies the feasibility and effectiveness of MIMO technology in suppressing turbulence effect.