74 cases of diabetes insipidus were reported in this paper. There were polydipsia,polyuris and low specific gravity of urine in all patients. Classification was determinedas follows: pituidary 64 cases (including idiopathic 44 cases, secondary 20 cases),nephritic 8 cases and unclassified 2 cases. Intracranial tumors should be paid altentionto rule out. 12 patients responded very satisfactorily to oral administration of singlechlorpropamide. In order to avoid hypoglycemia, an initjal dose of 10 mg/kg/24hr wasrecommended.