This description refers to a Pharmaceutical composition for Preventing and Treating senile dementia and its preparation method.The active ingredients of the pharmaceutical composition is prepared from medicinal raw materials comprising 20 to 50 parts by weight of Epimedii folium and - 55 15 parts by weight of Poria； or from medicinal raw materials comprising 20 - 50 part by weight of Epimedii folium, - 55 15 Parts by weight of Poria and - 55 10 parts by weight of Acanthopanax,Or from medicinal raw materials comprising 20 to 50 parts by weight of Epimedii folium, 15 to 50 parts by weight of Poria 15 - 50 parts by weight of Acanthopanax and 6 to 15 parts by weight of rhizoma AnemarrhenaeLa presente descripcion se refiere a una composicion farmaceutica para prevenir y tratar la demencia senil y su metodo de preparacion. Los ingredientes activos de la composicion farmaceutica se preparan a partir de materias primas medicinales que comprenden 20-50 partes en peso de Epimedii Folium y 15-55 partes en peso de Poria； o a partir de materias primas medicinales que comprenden 20-50 parte en peso de Epimedii Folium, 15-55 partes en peso de Poria y 10-55 partes en peso de Acanthopanax, o a partir de materias primas medicinales que comprenden 20-50 partes en peso de Epimedii Folium, 15-50 partes en peso de Poria, 15-50 partes en peso de Acanthopanax y 6-15 partes en peso de Anemarrhenae Rhizoma
