The purpose of this study is to investigate and analyze the willingness to learn on the part of the school teachers participating in the circulating teaching class of in-service learn-ing and to understand and explore the present situations and effectiveness of the circulating teaching class of in-service learning. The findings of this study may serve as reference for the future planning of the circulating teaching class of elementary and secondary teachers in-service learning in Taiwan. An investigative method was undertaken in this study. A total of 3,435 subjects, 2,553 elementary and secondary school teachers, 788 students of the circulating teaching class of in-service learning, and 94 professors of in-service learning classes were investigated. Totally three kinds of questionnaires were distributed and used in this study. Based on the findings of this study, the following conclusions were drawn: (1)The school teachers participating in the circulating teaching class of in-service learning are willing to learn. (2)Elementary and secondary school teachers are unwilling to apply for admission to the circulating teaching class of in-service learning, because they are kept busy with house-hold affairs. (3)The aim of those elementary and secondary school teachers applying for admission to the in-service learning is to increase the knowledge of special fields and teaching skills. (4)The appropriate time for elementary and secondary school teachers to participate in the in-service learning class is during the winter and summer vacations. (5)Teachers of elementary schools wish to take special courses of education, but teachers of secondary schools wish to take courses of special fields. (6)Teachers of elementary and secondary schools wish to get the Bachelor's degree.