The research aimed to investigate the contribution of using pen pal project in teaching writing skill. This research reviewed the previous studies on pen pal project in teaching writing skill which were published within the past eleventh years. This research used systematic review as the method. The population of this research was thirteen studies, then it screened used flow charts based on inclusion and exclusion criteria. There were five studies as the sample. This research used indirect observation as the technique and document analysis as the tools. To analyse the data, this research used thematic analysis as the technique analysis of data. Based on the results of the review, the results indicated that (1) The use of pen pal project media helped the teacher in teaching writing skill. (2) The successful of
using pen pal project in teaching writing skill based on students’ achievement increased. (3) pen pal project encouraged students’ interest, motivation, activeness,
and able to engage students’ attention. From the results above, the pen pal project gave the contribution in teaching writing skill.

Keywords: Systematic review, pen pal project, writing skill