The background of this study is based on the phenomenon that learning descriptive text writing as one of the language items that students got difficulty to start it as their comprehend. Especially in VII A of students of MTs Nu 08 Gemuh. They could not interest in teaching learning process, even they got difficulty when they were asked to writer. Discovery learning here is one of the learning model which emphasize in the process of the learning. Students could learn by observing which want to be learnt. They did not need to be afraid about the grammar rule at the first time they wrote, so it would be effective for students in seventh grade as VII A class of students of MTs NU 08 Gemuh.
This research is aimed to find the answer to the following research questions:
1. How is the implementation of Discovery Learning model in teaching descriptive text to improve students’ writing skill at seventh grade students of MTS NU 08 Gemuh in academic year of 2014/2015 ?
2. Can discovery learning model improve students’ descriptive text writing at seventh grade students of MTs NU 08 Gemuh in academic year of 2014/2015?
3. How is the improvement of students’ writing skill in teaching descriptive text after being taught using Discovery Learning model at seventh grade students of MTS NU 08 Gemuh in academic year of 2014/2015 after taught?

The study was to find out whether discovery learning model is more effective to improve students’ descriptive text writing than non discovery learning.
The implementation of discovery learning model in teaching descriptive text writing at MTs NU 08 Gemuh Kendal is A Classroom Action Research which is aimed to improve students’ achievement in writing descriptive text. This research was conducted in three cycles and was done in four activities including the pre cycle and cycle 1,2, and 3.
The result of study shows that using discovery learning model can improve students’ achievement in writing descriptive text. It can be seen that KKM which was determined in the school is 7,5. This is proven by students’ written test that improve in every cycle until achieve KKM. In this research, the researcher took a test of their achievement in each cycle. In the beginning, the researcher took pretest, but there is no students who get a required mark based on KKM. It can be seen in students’ ability in pre test, the low score was 20 and the high score was 60. The result of the average is very low, 51.17. Then the researcher took in cycle 1, there are only 8 students who got required mark based on KKM and the average of the students’ achievement was 67.2. In the second cycle, the researcher got 19 required marks from the students. The average of second cycle was 74.4 . It was little improved from cycle 1, but only 19 students of 34 students who got required mark in this cycle. The last cycle is more improved. It can be seen from the result of the average 82.3. Also all of students got required mark based on KKM.
The result of the research shows that the students improve their descriptive text writing effectively by using discovery learning model.