To study the effect of CLD on amino acid mediators and Znic in the brain of aging mice and to explain the relationship between the effect of CLD on senile Demention and amino acid mediators. Methods: The change of Glu, Asp and GABA in the brain were studied with HPLC measurement, the changes of Znic with AAS measurement. Results: The Glu, Asp and GABA decreased obviously (P