The background of this research was based on the observations that have been made by the researher with the teacher of Englsih of MA NU 04 Al-Ma’arif Boja. The unconducive condition happened in the classroom. Most of thestudents did not take attention in the learning activities. They changed their focus by talking with their friends, some of them were passive in the class, and they were careless with the material so thatthey had low ability in writing discussion text. Problem based learning is one of the strategy in teaching writing discussion text. Hopefully it can make the students more attractive in learning writing discussion text in order they can make easy to produce a good discussion text.

This research was supposed to answer some of research questions: (1) Howis the implementation of Problem Based Learning in teaching writing skill in discussion text in MA NU 04 Al-Ma’arif Boja? (2) To what extent the Problem Based Learning can improve writing skill in MA NU 04 Al-Ma’arif Boja?.

This research was using classroom action research which the cycle did in three times consist of pre cycle, cycle one, and cycle two. The subject of the research was XII-IPS students of MA NU 04 Al-Ma’arif Boja Kendal in the academic year of 2015/2016. The data was gotten from students’ achievement that was obtained from students’ score in the test, and data observation from students’and teacher’s activities during teaching learning process took place. There was also documentation that was used to look for the data concerning matters or the variable that are taken in the form of the note or photo in teaching learning process.

This research showed that implementing problem based learning to improve writing skill in discussion text could help the students. Problem based learning could be a solution for the students to make discussion text easier because problem based learning pose situation as stimulation which the students could develop ideas. There was an improvement on students score too. The mean of the tests scorewas 56,4 in pre cycle, it was becoming 67,1 in the first cycle, and it was becoming 74,6 in the second cycle.

Finally the result of this research had the improvement of students’ writing skill in discussion text and the improvement in the students’ positive response after being taught by problem based learning. Hopefully this research can be a reference for teacher of English to teach discussion text and for next researcher for conducting next research.