The purposes of this study were to study the level of student’s opinion toward the factors supporting the student’s self-discipline to study the level of the student’s self-discipline to study the factors related to student’s self-discipline and to study the factors supporting the student’s self-discipline at King Mongkut’s Institute of Technology Ladkrabang. The results of study were found that the student’s opinions towarded the four factors supporting the student’s self-discipline were at high level (X = 4.03) the student’s self-discipline in five aspects was at high level (X = 3.89). Four factors consisting of the student the family the institute and the teacher had positive relations with the student’s self-discipline. The factors about teacher student and family could predict the student’s self-discipline at 0.01 significance level. And 3 factors could predict the student’s self-discipline at 36.9%.