High spirit in enhancing teaching learning process in the framework of Lesson Study does not always show high performance in the overall management of the learning community. Big- unpredictable obstacles appeared in each stages and need certain reflection and specific treatment to cope with. In other words, it is really interesting to implement Lesson Study but, on the other hands, several phenomena appeared beyond the theory of Lesson Study it self. This paper tries to uncover the obstacles of the practice of implementing Lesson Study to improve teaching learning process of TEAL (Teaching English as an Additional Language) class in the English Department of University of Muria Kudus. Stages of teaching learning process was done in the concept of Lesson Study: Planning, Doing, and Reflecting. These stages were implemented with the main purpose to switch what the so called teacher centered learning to students centered learning. There are many obstacles appeared during teaching learning activity of “Lesson Study” of TEAL. Most of them dealed with how the colleques of the teacher take the role as members of learning community who hopefully played important role in developing the concept of teachng learning and material development. The second obstacles had something to do with the learning habit of the students which has been established in mood of being good listener in the classroom. The third obstacles worked in the session of reflection where it seemed difficult for some of the involved person to portrait the real problem in lesson study class.