The design of this research was a classroom action research. This research aimed to explain the extent to which Story Grammar can improve students reading comprehension on narrative texts and find out what factors influence the changes of students reading comprehension. The subject of this research was the students at grade VIII of SMPN 4 Woja which consisted of 30 students. In this research, the researcher used quantitative data to see the improvement of the students reading comprehension and factors that influence the changes of students reading comprehension. The instruments of this research were reading comprehension test, pre test and post test. Based on the result of the test, the students who passed the standard score improved from 30% in the preliminary data to 72,30% at the end of the research. It means that, Story Grammar successfully improves the students reading comprehension.
Key Words : Reading Comprehension, Narrative Text, Story Grammar.