The purpose of this research was to explain the influence of problem based learning model and reading habit on the students’ skill to write exposition in class X of SMA Negeri 1 Sungai Limau. This was a quantitative research was 180 which applied 2x2 factorial experimental design. The population of the research was 180 students in class X of SMA Negeri 1 Sungai Limau. The sample was chosen by using random sampling technique. Based on the results of the research, four conclusions were drawn. First, exposition writing skill of the students taught by using problem based learning model was better than that of students taught by using conventional learning in class X of SMA Negeri 1 Sungai Limau. Second, exposition writing skiil of the students having high reading habit taugh by using problem based learning model was better than that of students though by using conventional learning in class X of  SMA Negeri 1 Sungai Limau. Third, exposition writing of the students having low reading habit taught by using problem based learning model was better than that of students taught bu using problem based learning in class X of SMA Negeri 1 Sungai Limau. Fourth, there was an interaction between reading habit and problem based learning model in affecting the students’ exposition writing skill in class X of SMA Negeri 1 Sungai Limau.

influence, exposition, PBL model, reading habit

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