The purposes of this research were to find out the situation of different groups and styles of the foul of the National Universities swimming Competition swimmers and to provide preventive countermeasures and improving methods for every foul play. All I hope is that the swimming coaches in Taiwan would put emphasis upon the training of standardized swimming techniques. According to the disqualification reports that were written by the judges in the National Universities swimming competition of Taiwan in 96's, the results of the statistic analysis demonstrated that in the National Universities Swimming Competition, basing on different groups, the male amateur group fouls the most then the female amateur group comes the next. As regards the swimming styles, the fouls in the relay races are apparently much more than other items; especially starting diving ahead of the time is the major cause of foul. In terms of the swimming competition regulation, canceling the qualification is the only way of punishing. Therefore, totally understanding the regulations and practicing the swimming styles correctly during the training are the efficient ways of preventing the fouls in the competition.