[[alternative]]The Study on the After-School Exercise Behavior and Its Causes of the High School Students In Miao-li

[[abstract]]The study aims to survey the current situation of the after-school exercise behavior of the high school students in Miao-li, including personal backgrounds, exercise expected results, exercise efficiency, exercise social support, exercise interferences, and the relationship between one and another exercise. 544 efficient subjects were selected by the a stratified random sampling method, from two high schools in Maio-li, and were surveyed with questionnaires. The acquired data was then dealt with through Descriptives, Chi-square, One-way ANOVA, Scheff’s posterior comparison and Pearson’s product-moment correlation, The results were listed as below: （1）The percentage of those with regular exercise was higher among the boys (74%) than among the girls (58%). In both groups of the boys and the girls, most of the subjects exercise twice a week, with the percentage of 32% and 43% respectively. Moreover, the duration of the boys’ exercising was longer. （2）Most of the subjects take exercise with their classmates or friends, and the school was where they may go most frequently. Without difference between the sexes, basketball and cycling turn out to be the most popular items. （3）In the respect of expected results, those who attend cram schools tend to get high scores than those who do not. （4）The efficiency of the subjects was not high, which was higher among the boys than among the girls, senior high school students than vocational high school students, sporting-club participants than non-sporting-club participants. （5）There was not much social support that the subjects can get. The major one was from their friends, providing mainly emotional and informative supports, but less in the aspect of facilities. （6）With respect to the interferences, the subjects consider their busy studies, little free time, etc. to be the factors that may hamper their participation of the exercise behavior. After school. It was found in this study that the exercise behavior of the subjects tends to vary in accordance with the personal background and the social factors, School turn out to be the most popular place where students would go exercising. It was therefore suggested that facilities on campus be open to the students and the people in communities to increase the popularity of exercise behaviors.