#$%^&*AU2020101309A420200820.pdf#####Abstract This invention discloses a pharmaceutical composition for treating Alzheimer's disease, its preparation method and use. The active constituents in the described pharmaceutical composition are composed of 8~30 pbw of total saponins of Polygala tenuifolia and 1~5 pbw of volatile oil of Acorus tatarinowii. The pharmaceutical composition of this invention can effectively treat Alzheimer's disease.