The critical role of testing and assessment in developing teaching, learning and designing curriculum is undeniable. However, the challenges of EFL teachers when assessing writing have yet to be paid adequate attention, leaving a gap for research. This qualitative research intended to find out the difficulties that EFL writing teachers at the Faculty of Tourism and Foreign Languages, Vietnam National University of Agriculture (FTFL, VNUA) had confronted. Through interviews, six participants shared their background knowledge, challenges in assessing writing, and their training needs for testing and assessment.