From the perspective of pedagogy, this study aims to recognize the influence of students' learning motivations and computer self-efficacy when learning through online platforms, with learning achievement as the criterion for future instruction and related studies. By literature review, this study probes into related learning theories and actual operations as the base of research development, and elaborates on the students' differences of learning achievements according to questionnaire and learning performance. The results show that: 1. Learning motivation positively influences computer self-efficacy. 2. Learning motivation positively influences learning effectiveness. 3. Computer self-efficacy positively influences learning effectiveness. 4. Computer self-efficacy reveals mediating effects between learning motivation and learning effectiveness.