Depression disorder is a common mental illness. Early diagnosis and timely intervention are very important for the prognosis of the disease. At present， clinical diagnosis is still based on symptoms， and the diagnosis of diseases may be affected by the subjective cognition of clinicians， which lacks objective basis. In recent years， the emergence of eye tracking technology can help clinicians find potential objective indicators， which is of certain significance in the diagnosis of depression. This paper summarizes the characteristics of attentional bias in patients with depression and the research progress of eye tracking technology in the diagnosis and intervention of depression