The problem formulation of this research was: How is teacher’s professional competence in teaching English at the tenth grade of Al-Falah boarding school Banjarbaru South Kalimantan and What strategies are used by teacher to develop the professional competence in teaching English at the tenth grade of Al-Falah boarding school for girls Banjarbaru South Kalimantan. This research intended: The teacher’s professional competence and the teacher’s strategies to develop the professional competence in teaching English at the tenth grade of Al-Falah boarding school Banjarbaru South Kalimantan.
The subjects of this research were miss-matched teacher in teaching English of Al-Falah boarding school for girls and 20 students at A tenth grade of Al-Falah boarding school for girls.The objects of this research were professional competence of miss-matched teacher and the strategy was used by miss-matched teacher in teaching English at tenth of Al-Falah boarding school for girls. The research design was qualitative research. To collect the data, the researcher used
Observation to miss-matched teacher’s teaching and observation checklist to the students at A tenth grade, and interview to miss-matched teacher. The researcher also did some steps to analyze the data: editing, coding, data reduction, data display, data analysis and drawing conclusion.The result of this research showed that: 1. Professional competence of miss-matched teacher is very good because from the eighteenth points in Satori’s theory she did sixteenth points which are mastering of subject matter, management of teaching and learning program, classroom management, media and learning resources, educational foundation and innovation, assessment, educational institutions and programs in the schools, thinking method, professional missions, assistance and guidance to learners, characteristics of learners, school administration, brave to take decision, curriculum development, planning and program, and using time appropriately. 2. Miss-matched teacher uses many strategies to develop professional competences such as training, workshop, seminar, reading, studying or course and asking knowledge with others.