The purpose of this study is to examine exercise behavior among college students in Taiwan. According to region and numbers of school, 400 self-designed questionnaires were delivered to 10 colleges to collect data. The further analysis included the variables of demographics. There are 331 valid questionnaires, and the analysis result shows that 77% college students exercise in daily life. The main exercise includes aerobic exercise, ball exercise and physical exercise. The most exercise frequency is 2 days in a week; the exercise duration lasts 31 ~ 60 minutes; the exercise intensity is "both sweat and gasp." The reason of exercise is physical factor; the reason of not exercise is life factor. The further analysis result shows that "the exercise or not" will be affected by "self-estimated physical condition," exercise frequency will be affected by gender, age and "assess self physical condition," exercise duration will be affected by "assess self physical condition;" exercise intensity will be affected by gender. Gender will not affect the reason of exercise. When chemographic factor excluded, the top 3 reason of exercise are physical factor, mental factor and Subjective Norms factor (female are physical factor, mental factor and social factor). Gender will not affect the reason of not exercise. Except other factors, the top 3 reason of not exercise are life factor, physical factor and social factor. According this study, it demonstrates that 80 percent college student have exercise behavior, besides the main exercise include aerobic exercise and ball exercise. Based on the 333 exercise criterion of the Ministry of Education, most student don’t up to the standard. The main reason of exercise is physical factor. The further analysis result is that the reason of exercise in male student are mental and social and the females are physical and available.