Actual continuity of the problems stated in this article caused by the fact that modern education is directed at the formation of a mobile person of the teacher, who is able to transform the educational reality and himself in accordance with the requirements of a developing society, and to provide not only high-quality mastering studying the necessary content, but also the development of their personal qualities. The purpose of the article is to develop content-technological aspects of professional mobility of teachers in supplemental education system. The leading methods of research were: interdisciplinary analysis and data synthesis of the philosophical, sociological, natural-scientific, psychological and educational literature; analysis of foreign and domestic psychological and pedagogical experience for the formation of a mobile person in the educational systems; conversation, written survey, interviewing teachers and heads of educational institutions, the method of expert evaluations and self-evaluations; a method of self-managed adults, summarizing these results and ascertaining the formative experiment. The article reveals the essential characteristics (integrity, complementarity, coherence) and structure (personal activity, willingness to perform social roles, adaptability and creativity), formed the conceptual and categorical apparatus of personal mobility, specifications for the detection of the level of its development are proposed, psychological nature of personal mobility the teacher as a value-semantic constructs are disclosed in content and technological aspects of mobility in the system of supplementary education. The results can be used for the organization and implementation of supplementary educational qualification of teacher's development programs.