The purpose of this study is to analyze the characteristics of the best practice cases presented in the case study contest sponsored jointly by Cheongju National University of Education and the Korea National University of Education. The subjects were analyzed based on the teaching methods, content, reflection/ diffusion of each subject, focusing on middle and high school, Korean language, English, and mathematics subjects. As a result of the analysis, it was shown that the method of teaching Korean language was diversified and the rate of student - centered problem - solving learning was increased. The English needed proper reconstruction in terms of goals and contents, The need to improve communication skills. In the mathematics department, there were diverse and creative attempts methods of teaching. However, the contents of the class seemed to have limitations such as understanding of basic contents and mastery of exercises. Teachers are responsible for class innovation. Teachers are required to design and experiment with new methods of teaching by demonstrating creativity. So we should be able to discuss and solidify these efforts. It seems that the contest for the case study should play such a role.