Abstract: 30 aged patients with chronic subdural Hematoma （CSH） examined by CT scan were reported. In them 26 cases were operated on and conservative treatment performed for 4 cases who had been gained postmortem diagnosis during 1980 to 1989. 18 cases （60%） had a history of trautna in different degree, In all patients, the features of increased intracranial pressure were not prominent. 43% cases of the patients showed appearance just like the intracranial space occupying lesion and the rest 57% cases were similar to the cerebrovascular disease or the other. As for the diagnosis of CSH in the elderly, CT scan have been very useful. It is emphasized that there is a satisfying results in the burr hole and drainage for surgical treatment of aged patients with CSH. The trauma playing a role in the formation of CSH in the elderly was discussed and the literatures on CSH were also reviewed.