Due to the amendment of the University Act, the curriculum of physical education (PE) had been turned from the four-year required into the partly elective. On the other hand, the PE curriculum has enhanced to the alternative international language, instead of traditional skills teaching. Hence, it became fatally important to the office of PE to improve the programming and implementation of PE curriculum, so that students may be attracted to enroll in it. The purposes of the study were to validate the behavior of senior undergraduates enrolling in the elective PE courses; to explore the relations among the variables proposed by the elective PE courses; and to present practical suggestions to the offices of PE. The study surveyed on the senior undergraduates having enrolled in the elective PE courses in the Fall, 2006 in Fu-Jen Catholic University. The structural questionnaire used in the study was developed by the researcher and regarding the PE enrollment it could be divided into five major variables measured: attitude, subjective norms, perceived behavior control, behavioral intention, and last, demographic data. Taking the framework, the study integrated some variables related. Descriptive statistics were conducted to test the hypotheses of the study. Data were processed in the SPSS for Window 13.0.The results showed: Most variables proposed by the attitude, subjective norms, perceived behavior control, behavioral intention were related one another, just as the original model showed. Therefore, the scale of attitude was effective enough as the predictor for students not enrolling in the elective PE courses.