Some patients believe that psychological tests can be used to diagnose depression. Some patients think that psychological tests are not useful or not necessary in the diagnosis of depression. This view is also one-sided. (1) Psychological tests can help doctors quickly and scientifically obtain the psychological characteristics, personality tendencies and other psychological indicators of the test subjects in a relatively short period of time, which can effectively avoid the problems missed by doctors due to negligence; (2) Psychological tests can be used to evaluate the severity and treatment effects of psychological disorders (including depression). (2) Psychological tests can be used to evaluate the severity and treatment effect of mental diseases (including depression). (2) Psychological tests can be used to evaluate the severity of psychological disorders (including depression) and the effectiveness of treatment. Therefore, the role of psychological tests in the process of depression diagnosis should be viewed objectively.