Abstract:From the dry bulbs of Cistanche deserticola a branch of orobahchaceae plant growing in Inner Mongoliatwo active antisenile constituents(D-mannitol and polysaccharide) were isolated and identified. Chemical analysis andspectroscopic tests show that D-mannitol corresponds to the authentic atandard ,and polysaccharide is condensed fromrhamnose,xylose,arabinose and galactose.