To optimize the marine culture facilities for abalone, especially the cage structure, this paper studied the behavior and growth differences of juvenile hybrid Pacific abalones under different light intensities based on the comparison experiments with three groups of abalones cultured under the light intensity of 0 Lx (dark light), 0~500 Lx (weak light), and 0~6 500 Lx (strong light), respectively. The result showed that, for abalones of the size of (15.08±1.07) g in weight and (4.86±0.17) cm in shell length, the average daily growth of shell length and that of body weight were respectively 14.11 μm/d and 54.82 mg/d in the dark light group, 8.37 μm/d and 46.02 mg/d in the weak light group, 6.95 μm/d and 28.48mg/d in the strong light group. The impact of illumination on the growth of shell was more outstanding than that on the growth of weight. The daily feeding rates were 9.92% in the strong light group, 10.26% in the weak light group, and 11% in the dark light group, while the feed conversion ratios were correspondingly 1.75%, 2.68% and 2.92%. The juvenile abalones living in the dark light group were more active and took food half an hour earlier than the other two groups, demonstrating the best appetite and fastest feeding speed. Such result showed that high illumination intensity could cause a suppressing living environment for the abalones and affect their normal behavior and growth. For marine culture, their response to light stress should be considered to select the optimal water layers and optimize the cage structures.