There are some raising questions about reliability to derive the most proper information in a research thesis when a researcher researches or investigates other's experience. It is difficult for a researcher to generalise other's knowledge groundwork because it obtains through one's very own personal experience. Neither comparable nor definable one's inner insight, which gains his/her individual lived experience, because it contains various values. In contrast, research into researcher his/herself, it enables him/her to explore the subject in depth and authentically. Therefore, it is argued that autoethnography, which uses researcher his/herself as a major subject as well as data of the research, is able to recognise the importance of one's own lived experience as a social contexts in a broad perspective. In this article, it focuses on practice-based research, which blurs research and researched based on ontological thought, and analyse autoethnography to explore the validity for research into one's individual self. This article argues,Firstly, autoethnography is an emerging methodology in that it is necessary to describe its brief theoretical background as well as methodological value and criticism. Secondly, it is said that dance is mostly, composed of a dancer's inner experience, which is difficult to define and depict, and therefore, it argues the suitability of autoethnography as a methodology for dance. Finally, it analyses the moment of arising different perspectives when the researcher's subjective and personal thought transform into very objective text, and through this mixing process it investigates the validity of self-research. It is still very rare to use autoethnography as a methodology in academic dance filed, even though it already emerged practice-based research which is researcher analyse his/her own work. Therefore, the essential aim of this article is explore the value of research into researcher's his/herself to prove reliability and validity of practice-based research through autoethnography.