This study investigated junior high school English teachers’ implementation process and teaching praxis in the Professional Learning Community (PLC) across counties in Taiwan. There are three specific aims: (1) To explore the background and core values of PLC and participants’ motivation. (2) To define the implementation operations of PLC and their challenges. (3) To record PLC core members’ teaching praxis. Our study subjects were seven junior high school English teachers across various counties who had established and consistently maintained PLC in Taiwan. The main results of this study are as follows: (1)Administrative support from the Ministry of Education and the Education Bureau substantiated the across-county operation of PLC, which in turn promoted the professional growth of the participating teachers. (2) The success of the across-county PLC was due to the interactions and sustainable development of the local PLC. (3) The implementation progress of the across-county PLC helped the core members improve their teaching strategies, and promote the common good of teachers and students. From these key results, this study also provides specific suggestions for educational authorities, junior high school administrators, school teachers and future researchers.