This paper investigated the types of research methods in Korean Language Education(KLE) and related issues. The research methods involved many elements such as data collection, position and viewpoint of researcher, research purpose, researcher’s intention, time, degree of controlling, utilizing, and using machine. Based on these elements, research methods of KLE could be classified and contrasted. Those are conceptional and empirical research, pure and action research, longitudinal and cross-sectional research, experimental and ethnography, introspection and discourse analysis, case study and survey study. Any research itself has multiplicity and complexity. So we should understand that there are many aspects of any one research. To advance research methods of KLE, it is needed to know the complimentary of conceptional research and empirical research. Theoretical research and action research develops dialectically. Teacher’s inquiry is important, and the concept of ‘teacher researcher’ should be established.