This study was attempted to cumpare the effects on blood glucoge of 5% Dextrose in Water (D5W) and Hartmann's solution infused during halothane anesthesia.20 female patients in the state of A.S.A. classification 1 were chosen and divided into 2 groups, i.e. first group D5W. the second group Hartmann's solution. Blood samples were collected on the operating table prior to starting I.V. infusion, after 1/2 hour, 1 hour and 11/2hour from the time 1.V. infusion started. Intravenous fluid was administered at 10 ml/kg/hr. Changes of blood glucose levels were as follows. In the group of D5W, the values of bleed glucose were 83.4±13.5 mg% at N.P.O., 198.4±33.6 mg% at 1/2 hour, 245.5±55.6mg% at 1 hour, and 259.5±40.1 mg% at 11/2 hours. In the group of Hartmann's solution, the values of blood glucose were 64.9±9,5 mg% at N. P.O., 93.3±21.9mg% at 1/2 hour. 99.0±15.6mg% at 1 hour, and 105.6±24.2mg% at 1 1/2hours.