Inclusion Criteria:  Patients suﬀering from MDD in accordance with the diagnostic criteria; Hamilton Depression Scale score is between 21 and 35 (mild to moderate MDD); 18≤age≤60 years, both gender; Patients who have not used antidepressants and other psychiatric drugs (including traditional Chinese medicine), or have used them but have stopped for at least 2 weeks; Patients have clear consciousness and could communicate with others normally; Patients could understand the full study protocol and written informed consent is provided by themselves. Note: Subjects who meet the above six items will be included.  Exclusion Criteria:  Patients with bipolar disorder; Patients with schizophrenia or other mental disorders; Patients with severe medical diseases, tumors or diseases of the central nervous system; Patients suﬀering from severe depressive episode with psychotic symptoms; Suicidal patients; Patients with seasonal depression; Patients with organic depression; Patients with alcohol or drug addicts; Patients using other therapies; Patients in pregnancy or lactation; Patients suffering from cognitive dysfunction, aphasia or other diseases that cannot cooperate with treatment; Patients with pacemakers; Patients who are not suitable for electroacupuncture.