With reference to the framework of Communities of Practice proposed by Etienne Wenger, the study suggests an implementation project for cultivating common goals among learning areas leaders and improving their leadership skills. In the form of action research, the study involves participatory observation and interview. It sets forth to enlighten the understanding and conversation among subject leaders; it is hoped that they can share valuable experience with and mentally support each other in difficult situations, strengthening their leadership character and teamwork. The result shows that the sense of communities of practice, along with positive experience, can encourage the learning areas leaders to reflect on their performance; peer learning among the participants can also enhance their leadership capabilities. Future studies can be conducted to confirm or refine the current findings.