Having reading comprehension ability English text is very important for EFL students. As one aspect which influences the students’ reading, mastering vocabulary is useful for students to help in understanding and avoiding mistake. This research analyze is there any correlation between students’ vocabulary mastery and their reading comprehension ability of the second students of MTs Darul Hijrah Putra Martapura
In this research, the writer used quantitative method by Pearson correlation product moment. There are two variables in this research. Students’ vocabulary as independent variable (variable X) and Reading ability as dependent variable (variable Y), the technique of collecting data was by using a test. The test consists of 20 items of vocabulary test and 20 items of reading comprehension. The object of study is 28 students from class II at the second grade students of MTS Darul Hijrah Putra in the academic year 2018/2019.
From the calculation by using product moment formula, it was found out that the mean of the scores of the vocabulary test is 2050. The mean of the scores of the students’ achievement in reading comprehension is 1855. The result of applying the rxy distribution shows that the coefficient correlation is 0.69. It means that the correlation between students` vocabulary mastery (Y) and reading comprehension skill (X) there is a strong correlation. So, alternative hypothesis (Ha) is accepted and null hypothesis (Ho) is rejected. The conclusion of this research is there is a significant correlation between students’ vocabulary mastery and their reading comprehension ability.