Depressive disorder is a relatively common psychological disorder. Many people who suffer from depression often do not take the initiative to seek medical help for various reasons, which leads to the aggravation of the disease and affects their work, study and life; some people even mistakenly think they are suffering from depression after doing some scale assessment online. Regardless of whether you are sick or refusing to seek medical help, it is important to understand how depression is diagnosed by physicians. The doctor will conduct a comprehensive clinical assessment of the patient after the depressive disorder consultation, which simply includes three aspects, one is to understand the medical history, the second is a comprehensive examination to exclude physical diseases, and then is based on the medical history and examination to determine the diagnosis and develop a treatment plan I. Understanding the medical history 1. 2, psychosocial factors: traumatic life events, such as the death of relatives, marital changes, occupational changes, etc. 3, physical illness: the proportion of people suffering from physical illnesses who suffer from depression is greatly increased. 4, clinical manifestations of previous episodes: pay special attention to the presence of previous light manic or manic episodes. 5.Frequency of episodes: number of episodes, duration of each episode and length of remission period, etc. 6.Past treatment and efficacy: treatment method, treatment process, drug dosage, efficacy and side effects, etc. 7. Past history and personal history: past history of physical illness and medication, alcohol and drug dependence, drug allergy, personal personality characteristics, etc. 8, family history: whether there is a family history of mental illness. Comprehensive examination to exclude somatic diseases 1. physical examination (to exclude somatic diseases) 2. physical examination: electrocardiogram, electroencephalogram, cerebral hemogram, heart rate variability and eye movement examination (to exclude somatic diseases) 3. laboratory examination: blood routine, blood biochemistry, endocrine examination, etc. (to exclude somatic diseases and assess the patient’s liver and kidney function to provide a basis for treatment selection of drugs) 4. psychological measurement: MMPI, SCL-90, SAS, SDS, etc. (to clarify the patient’s personality characteristics and assess the symptoms) 5.Psychiatric examination (to comprehensively assess psychiatric symptoms and establish symptom clusters)