老年痴呆(Senile dementia)占老年性精神病的首位。据不完全统计对国有精神病患者1000万,先天愚型患者500万。美国64岁以上老人有1/6患者有某种类精痴呆。日本老年性精神病患者占60岁以上老人的10％以上,世界上日益增多的老年痴呆,精神分裂症等患者已成为医学和社会的严重问题,到目前为止国内外对老年痴呆,型神分裂症等患者发病机理虽有很多研究、但都偏重于临床诊断,临床病理检查和药物性能 Senile dementia ranks first in senile dementia. According to incomplete statistics, there are 10 million state-owned mental patients and 5 million patients with Down’s syndrome. One in six Americans in the United States over 64 years old has some kind of dementia. Japan’s elderly mental patients account for more than 10% of the elderly over the age of 60, the world’s growing number of Alzheimer’s, schizophrenia and other patients has become a serious medical and social problems, so far at home and abroad on Alzheimer’s, schizophrenia Although the pathogenesis of other patients, although many studies, but are biased in clinical diagnosis, clinical and pathological examination and drug performance