A method for treating Alzheimer’s disease and a method for downregulating protein aggregation in brain are disclosed, which respectively comprises: administering a zinc finger-like peptide to a subject in need thereof, wherein the zinc finger-like peptide comprises an amino acid sequence of RRSSSCK (SEQ ID NO: 1).本發明揭露一種治療阿茲海默氏症及負調控腦中蛋白質聚集之方法,其分別包括:對需要之患者給與一鋅手指樣胜肽,其中,該鋅手指樣胜肽包含一胺基酸序列RRSSSCK(SEQ ID NO: 1)。