The purpose of this experiment was to investigate the acute effects of exercise of different intensities on plasma lipoprotein and apoprotein profiles: triglyceride(TG), free fatty acid(FFA), total cholesterol(TC), HDL-C, LDL-C, apo A-I, and apo B, Ten healthy male college students(20.2±0.6yrs) completed anthropometric measurement and familiarization session, a maximal aerobic test, and two experimental exercise test sessions. A maximal test of aerobic capacity was administered by the ramp treadmill test. After the VO₂max had been measured, the subjects were asked to report to the laboratory two times on the same weekday of a successive week at 7 a. m. Two exercise tests (50%, 80% of VO₂max) were randomly scheduled by draws. On each condition the subject had fasted overnight and ran on the treadmill for 30 min at the assigned intensity. Blood samples were drawn from the antecubital vein at pre-exercise, post-exercise, 30 min, 1 hr end 2 hr post-exercise. All concentrations were corrected for plasma volume changes. A Repeated Measures ANOVA indicated that TG was changed significantly with exercise at 50% of VO₂max and that plasma FFA, apo A-I and apo B were changed significantly with exercise at 80io of VO₂max. TG was significantly decreased after 30 min, 1 and 2 hrs post-exercise with exercise at 50% of VO₂max. Plasma FFA level was significantly increased after 2 hrs postexercise with exercise at 80% of VO₂max. Plasma apo A-I was lower at post-exercise(p＜0.01) and increased slightly at 2 hr post-exercise. Plasma apo B was lower at post-exercise＜p＜0.05) and returned to pre-exercise level in 2 hr post-exercise. Plasma TC, HDL-C, and LDL-C levels were nor changed significantly with exercise at 50% or at 80% of VO₂max. These results suggest that intensity of 50% and 80% VO₂max may enough to affect the acute transient modification of TG, FFA and apoprotein concentration.