In recent years， the study found that people with depression are widespread obvious selective attention bias， with excessive attention to negative emotional information， difficult to remove， and lack of attention to positive emotional bias. It is found that it may be not only an important factor of recurrence of depression， but also an important indicator of diagnosis and evaluation， and even an important target for depression treatment. Yet， more evidence is needed to support this theory. In this paper， the mechanism and treatment of obvious selective attention bias in depression are illustrated