The main purposes of this study were to investigate the difference of teaching beliefs between participated the teaching discussion group or not among the preschool physical education teachers. Firstly, 13 experienced preschool physical education teachers were interviewed in order to understand the concepts of teaching beliefs. Based on the qualitative data, a questionnaire was developed and was sent by mail to preschool physical education teachers in Taiwan. Stratified random sampling was used for the targeted sample population. 440 completed surveys were received and analyzed. The results were as follows: There were 43% participation the teaching discussion group and they were better in 'teacher efficacy', 'teaching skills', and 'teacher-student relationship' of teachers teaching beliefs than those weren't participation the teaching discussion group. The teaching beliefs of teachers who were participation the teaching discussion group could get progression contiguously. They did promote their professional teaching ability by way of teaching reflection. In the future, we hope to explore how to discuss of the teaching discussion group to promote teachers professional growth.