Positive moral emotions,such as gratitude,have numerous positive effects,but it remains unclear how they affect malevolent creativity.This study examined the effects of gratitude on malevolent creativity and its underlying mechanisms through two survey studies and one experimental study.The results showed that:1)trait gratitude negatively predicted malevolent creativity;2)moral disengagement partially mediated the effect of trait gratitude on malevolent creativity;3)dark personality moderated the effect of state gratitude on moral disengagement,with an indirect effect of"state gratitude-moral disengagement-malevolent creativity"being significant when the level of dark personality was high.The findings highlight the important role of gratitude in preventing and reducing individuals'malevolent creativity and reveal the underlying mechanisms.