［Purposes］To study the effects of different illumination intensity on personality of Labidochromis caeruleus juvenile. ［Methods］Under the laboratory conditions (25.0±0.5) ℃, the experimental fish were acclimated under different illumination intensity rearing environment (0, 35, and 100 lx) for 14 days, and the boldness and sociability of the experimental fish were measured after being acclimated with different illumination intensity. ［Results］Compared with the fish acclimated under conventional rearing environment (100 lx), the latency to enter the open area of fish acclimated under the low-light (35 lx) and dark (0 lx) rearing environments increased, the frequency to enter the open area and the percentage of time stayed with the stimulating fish shoal decreased. The boldness and sociability of experimental fish were significantly decreased after domestication under different illumination intensity conditions (p<0.05). ［Conclusions］L. caeruleus juvenile showed different personality and behavior responses acclimated under different illumination intensity, and the change of boldness was opposite to those of sociability.