Aestheticians pointed out that the long immersion in the beautiful environment plays an important role on the moral education. The research mainly tested the opinion and examined the influence of the environmental aesthetics on moral behaviours and immoral behaviours. Meanwhile, we also further explored the possible pathways for environmental aesthetics influencing moral education, the mediating role of moral disengagement. We invited 334 junior high school students to complete relevant questionnaires. The results found that the higher environmental aesthetics, the lower moral disengagement, and further the higher moral behaviours (the number of donations) and the lower immoral behaviours (lying behaviours). The results also found that the mediating role of moral disengagement in the relationship between environment aesthetics and immoral behaviours. But the moral disengagement didn't play a mediating role in the relation between environmental aesthetics and moral behaviours. These results demonstrated the effect of environmental aesthetics on moral education.