The purpose of this study was to investigate whether through a series of teacher training. The participants could acquire better knowledge on Positive Behavior Support (PBS), and develop high quality behavior intervention plans. Thirty-six teachers from three public schools participated in the study. The competency-based training consisted of 12 sessions based on several key concepts of PBS. The participants were divided into 7 groups, and each group was required to complete a section of behavior intervention plan after each training session, until all sections were completed. A group pretest-training-posttest pre-experimental design was used to compare the knowledge and the quality of behavior intervention plans before and after the training. Results showed the knowledge of PBS and the substantive quality of PBS plans can be improved with teacher training. The implications for future research and practices were discussed.