Emotional disorders are a collective term for various psychological disorders characterized by emotional abnormalities， including depression disorder， anxiety disorder， and obsessive-compulsive disorder. The metacognitive theory suggests that the generation and maintenance of emotional disorders are related to cognitive attention syndrome. Metacognitive therapy focuses on different aspects of cognitive attention syndrome in emotional disorders， mainly using delay techniques， attention training techniques， and mindfulness separation techniques. This paper elaborates on the mechanisms of repetitive negative thinking， attention bias towards threatening information， and self-regulation strategies in cognitive attention syndrome， as well as their role in emotional disorders， aiming to gain a deep understanding of cognitive attention syndrome and provide a basis for the treatment of patients with emotional disorders.