This article reveals the organizational experience of the professional development of primary school teachers during the inter-certification period in the system of lifelong pedagogical education of the Russian Federation. The issue of international experience features in practical implementation of teaching experience during the inter-certification period by the teachers of Russian secondary schools. The article analyzes the inter-certification period principles of organization of the primary school teachers (dynamism, variability, modularity, interaction, large-scale involvement, practical orientation, performance) and the levels on which the professional development of teachers in inter-certification period in the system of lifelong pedagogical education of the Russian Federation is carried out (primary, heuristic, creative, innovative). It was found that in the process of professional development during the inter-certification period Russian teachers participate in researches and experimental work, teaching sessions, educational ideas auctions, seminars, conferences, take the floor on the teaching meetings, organize open classes, plan the trajectory of self-educational activity, and create individual professional self-development plan; school administration monitors the qualification level, professional competence and performance of teachers.