Reading is an activity to get the information that we can get from reading some texts. The understand text strategically is the important point in reading activity. The students can reach more knowledge from reading activity, and they can learn about the grammatical system. It can be seen from the students’ activity in transfer the meaning in reading, including they should be understanding the grammatical system if they want to reach the idea of the text. In this era, we can easily understand the text by using ICT development meanwhile grammar becomes one of the materials in studying English. Based on the related statements above, the researcher would like to analyze the topic further, by using the questionnaire and grammar test, in order to know the correlation of students’ reading style and their grammar mastery. The formulated research problems were: 1) Do the more the students read text by the screen materials, the better their grammar mastery in learning English? and, 2) Do the more the students read printed materials, the better their grammar mastery in learning English? Based on the research problems above, the purpose of this study was to find out the correlation between students’ reading style and grammar mastery towards the first grade of Vocational high school (SMK) students’ Babussalam Pagelaran Malang, especially majoring in software engineering. This study used quantitative research design. The participants of this study were 48 students, the first grade of SMK Babussalam from class A and B, both of class were handed a questionnaire contains students’ reading style, reading from screen and reading from printed book Then, the researcher also collected the data on students' grammar mastery based on the results of a grammar test that the researcher conducted in the classroom. To analyze the data, the researcher used descriptive statistics and Pearson product moment correlation. The finding revealed that there is a correlation between students who are passionate about reading on screen and their grammar mastery. The second finding revealed that there is no correlation between students’ who are passionate about reading printed books and their grammar mastery based on the students score. It was proved by the result of the analysis by using SPSS V.20. The mean score of the reading on screen was 16.69, and the mean score of the reading printed was 18.96, while the mean score of the grammar mastery was 61.54. Then, the first result of sig. (2-tailed) value showed that p value 0.042 was lower than α 0.05, (0.042 < 0.05). The result of this research was that the more students read text with screen material, the better their grammar mastery in learning English. However, this is inversely proportional to reading printed materials because the results of this study stated that there was no correlation between reading in printed materials and students' mastery of grammar. It means that even though the more students in Vocational High School of Babussalam read with printed material, it doesn't mean their grammar mastery is getting better. Keywords: Students’ Reading style, Students’ Grammar Mastery, Correlation