The researcher focused on the use English Short Story in developing students’ vocabulary at the seventh grade of MTsN 3 Aceh Besar. The research question of this research how what effective are English short stories as a tool to improve vocabulary acquisition among students at MTsN 3 Aceh Besar. The aims of this research were to find out whether the use of English Short Story is effective to developing student’s vocabulary at the seventh grade of MTsN 3 Aceh Besar. This research applied experimental teaching. The population of this research was the seventh grade of MTsN 3 Aceh Besar. The number of populations was 15 classes. The sample was the seventh-grade students consisted of 24 students. To collect the data the researcher gave them pre-test and post-test to students, the data analyze by using SPSS 22. The finding of this research showed that the implementation of English short story is effective in developing students’ vocabulary. Based on the result of mean score in pre-test was lowest than the mean score in the post-test (57,37< 80, 00), and the standard deviation of pre-test and post-test in experimental class is (7, 61< 10, 74). From the result, it can be concluded that English short story was effective in developing students’ vocabulary. Based on the score of mean and standard deviation of post-test was higher than pre-test in experimental class.