Classroom research addresses three characteristics educational research questions : practicality, complexity and uniqueness, and continuity and effectiveness. This paper reviews new trends in classroom research in terms of these characteristics. To consider practicality, the relationship between teacher and researcher is categorized and action research, design-based research and lesson study are the new trends. As regards complexity and uniqueness, the new trends are ethnography and ethno-methodology as qualitative research. To examine continuity and effectiveness, international comparisons of classroom research are discussed.