This research intended to determine undergraduate EFL encounter different and greater challenges in their thesis writing process, and their strategies to overcome their thesis writing.  Five students at the Departement of English Education, UIN Walisongo Semarang who has already finished their own thesis writing were involve in this study.  The study used a qualitative method with a case study approach, using interviews as a data collection method. The data collection was analyzed using thematic analysis and the reflective practice based on Gib's reflective cycle theory.  The finding revealed that undergraduate EFLs have already passed their challenges and finished their thesis writing nicely. Howover in the process when they doing their thesis writing they get so many challenges, but they create and design some strategies to overcome their challenges. It improves their skill at solving their problems as nicely as they can. They are not without hope, laziness, or feeling stuck, but they always motivate themselves. By creating and designing some strategies, it will help them in their thesis writing. Not only that, time management is also being one of the important factors to do it.