Depression, especially depression or depressive disorder, is one of the most common mental disorders. It is a group of disorders with mood or depressed mood as the main clinical manifestation, accompanied by different degrees of cognitive and behavioral changes, and some patients may also have psychotic symptoms, such as hallucinations, delusions, etc. Some patients have self-injury, suicidal behavior, or even die as a result. Some patients may suffer from self-injurious and suicidal behaviors and even die as a result. A single episode of depression lasts at least 2 weeks and often recurs, but most of the episodes are effectively resolved, and some patients may have residual or chronic symptoms due to repeated episodes, which may impair their social functioning. Therefore, in clinical practice, depression should be diagnosed and treated as early as possible, depression can reach clinical cure, early diagnosis and early treatment is the best way to get the efficacy of depression.