This study was caned out on 27 SDAT cases (male 14 female 13),age ranged 50 -78,anda group of normal persons of the same age,sex, and similar educational background was used ascontrol subjects. The results showed that the risk factors of SDAT were relative to serum Aluminium level, however, Vitamin C ingestion showed as protecting factors. Aging adults with highserum aluminum level for a long time should actively make effort to decrease their body aluminum loadings and take food containing more ascorbic acid.