For decades, task-based language teaching has become a commodity in ELT profession and has been the subject of many studies. Yet, there seems to be a paucity of research on the impact of TBLT on enhancing learners’ motivation in learning writing. In this regard, this article presents the results of student’s perceptions of the intervention of TBLT in teaching writing in two English classes for one academic term at one institution in Phnom Penh. The study examined the students’ perceptions regarding the impact of TBLT on their writing behaviors and motivation in learning writing before and after the intervention, as well as the constraints that they encountered during the implementation of TBLT. The results indicate positive-but-varying views regarding this intervention. Some challenges are also detected and suggestions are offered for future research in this area accordingly. The study has implications for EFL writing classrooms.