Objective To study the anti-aging effect of polysaccharides from Rhizoma Gastrodia on aging mice by D-galactose.Methods Fifty mice were randomly divided into control group,model group,low dose treatment〔2.5 mg/(g ·d)〕 group,middle dose treatment〔5.0 mg/(g ·d)〕 group and high dose treatment 〔10.0 mg/(g ·d)〕 group.An aging mice model was made by D-galactose subcutaneous injection.The ability of learning and memory of the mice in each group was tested by Morris water-maze.superoxide dismutase,glutathione perox...