 Chronic functional constipation is a common disease. To date there has not specific therapy on chronic functional constipation. Systematic reviews indicate that acupuncture is probably effective for the disease, but the evidence is limited. Recently, we have finished a multi-center clinical trial of individualized deep electro-acupuncture EA for chronic functional constipation n460, Registration ID: NCT00508482 which preliminarily showed EA was effective. 