Depression is mainly tested by scales, mainly including: 1. Self-assessment scales: that is, they are tested by themselves on these scales. Such scales commonly include the Zung’s Anxiety Self-Rating Scale, the Beck Depression Scale, the Flow Modulation Scale, and the Montgomery Depression Test Scale. These scales are relatively simple, for example, the Zung’s Anxiety Self-Rating Scale is a 20-question scale that the patient answers, after which a score is calculated based on these entries. If, for example, the Zung self-rating scale depression exceeds moderate to severe, then the patient some is probably depressed and if it exceeds moderate to severe, it may reach depression. But the test of these scales can only give an investigation of the degree of depression or the current state of depression, is an auxiliary examination, can not be used as a diagnostic scale; 2, other assessment scales: other assessment scales are slightly more complex, qualified psychologists or psychometricians, according to the patient’s situation to give the test. This scale may have higher reliability and validity for patients, but it may take more time. Both the Self-Reporting Depression Inventory (SRI) and the Other-Reporting Inventory (ORI) are diagnostic aids for depression and should not be used as a diagnosis.