Abstract: It is believed that yangming meridian and brain are closely related in physiology and pathology， and proposed that yangming blood accumulation， yangming internal binding and yangming deficiency can all lead to dementia. Therefore， treatment of dementia can be based on yangming. According to the patient's syndrome， methods such as cooling blood and removing blood stasis， dredging fu organs， reducing turbidity and invigorating yangming can be used， so as to harmonize qi and blood in yangming meridian and relieve dementia symptoms.