We expected that PBL (Problem based Learning) methode has good effectiveness for HTML(Hyper Text Markup Language) learning of elementary school students. In this study, a test was conducted in which a PBL method and the traditional lecture-based learning method were applied to an HTML class, and compared the level of educational accomplishment and compared the effectiveness of the two methods. PBL applied was based on the IMSA model of problem-based learning center. Educational accomplishment was evaluated base d on evaluation of theory and application skills. Test results revealed that there were no significant differences in theoretic learning between the two methods of learning. However, in application skills, the PBL was proved to be significantly more effective th an the traditional lecture-based learning method. Through the study, it was verified that PBL has a more positive educational effect that the traditional lecture-based learning.