This study aims to determine 1) the relationship between students' reading habits with the ability to write exposition text, 2) the relationship between students' discourse markers mastery with the ability to write exposition text, and (3) the relationship between students' reading habits and discourse markers mastery with the ability to write exposition text. This research was conducted in the tenth grade students of SMA Negeri 4 Serang in the odd semester of the 2018/2019 school year. The research method used was a survey method with correlational techniques. The population was the students of grade X. There were 450 students consisting of 180 male and 270 female. The sample was taken using purposive sampling technique. The sample was 88 students. The test was used to obtain data on the students' ability to write exposition texts and students' mastery of discourse markers, while the questionnaire was used to to obtain data on students' reading habits. The results showed that: 1) there was a positive and significant relationship between the students' reading habits and the students' ability to write exposition texts; 2) there was a positive and significant relationship between the students' discourse markers mastery and the students' ability to write exposition texts; and 3) there was a positive and significant relationship between the students' reading habits and the students' discourse markers mastery with the students' ability to write exposition texts.