Even though the implementation of 2013 curriculum is still in a controversy, the objectives of 2013 curriculum are for Indonesian better education. The teacher’s role is very necessary in the success of 2013 curriculum implementation. If the teacher implement it well, the students with real good quality will be created as the objectives of 2013 curriculum.

The objective of this study is to know the implementation of 2013 curriculum by the English teacher and its barriers on the dimensions of teaching learning planning, process, and learning evaluation.

The writer collected the data by using observation, interview, and documentation. The data was collected in January 2015 with the English teacher of grade X. The interview involved the English teacher, the principal, and the vice principal of curriculum. the documents are syllabus, lesson plans, and pictures.

The research shows that the implementation of 2013 curriculum by the English teacher on the three dimensions has the barriers. The barriers of the teaching learning planning affects the other two dimensions. The barriers are finding the right method and the right instrument of authentic assessment. They both are important to support the success of Core and Basic Competence realization in the learning.