The purpose of the study was to investigate the effect of aerobic training on VO2max of college men. Thirty students from Department of Engineering and Technology, Annamalai University were selected as subjects. The age, height and weight of the subjects ranged from 17 to 25 years, 162 to 175 centimeters and 56 to 70 kg respectively. The selected subjects were randomly assigned into two equal groups of 15 subjects each. Group I underwent aerobic training, group II acted as control. Prior to and after the training the subjects were tested on VO2max using standard test and procedures. Analysis of covariance was used to determine the significantly difference existing between pre test and post test on selected criterion variables. The result of the study proved that due to effect of aerobic training significantly increased the VO2max of college men.