Intervention Effect of High-Definition Transcranial Direct Current Stimulation (HD-tDCS) on Non-suicidal Self-injury (NSSI)

Inclusion Criteria: The patients were diagnosed by 2 or more senior clinical psychiatrists, meeting DSM-V criteria, and having 1 or more non-suicidal self-injurious behaviors in the last 6 months. 12-18 years of age. The medicine has not changed in the 4 weeks prior to or after this study, and if it has to be changed, the treatment medication is required to be at a subtherapeutic dosage level. Exclusion Criteria: The patient has suicidal ideation or has committed suicidal behavior T1 or T2 weighted phase magnetic resonance images show focal brain lesions patients had neurological disorders such as epilepsy, or serious physical illnesses patients had a history of substance abuse and drug dependence in the last 6 months or use of anticonvulsant drugs in the last 3 months patients had received radial cranial electrical stimulation or magnetic stimulation treatment in the last 3 months or received electroconvulsive therapy in the last 6 months patients had previous significant head trauma or EEG abnormality in the last 1 month body-mounted devices unsuitable for treatment, such as pacemakers, artificial valves, and other metal implants.