Scalp acupuncture has been used and developed clinically for more than 70 years, and its effects in the treatment of clinical diseases are obvious to all. Especially in the treatment of brain diseases, amazing results are often seen. But the mechanism of scalp acupuncture's effect has always been a beautiful mystery. Recently, I finally discovered some brain research to explore the therapeutic mechanism of scalp acupuncture for hemorrhagic stroke, ischemic stroke, Alzheimer's disease and other brain diseases. Generally speaking, they are all stimulated through scalp acupuncture. It can achieve the effects of protecting cranial nerves and promoting blood flow in the brain to obtain therapeutic effects on cranial nerve diseases.