The aim of this article is to ground the necessary and sufficient pedagogical conditions that guarantee development of research skills of primary school teachers in the system of postgraduate education. The author determines such pedagogical conditions as: a conscious motivation of primary school teachers to develop research skills as a prerequisite for the creative professional and research activities with the corresponding reflexive position concerning their improvement; orientation of teaching process on the development of research skills of teachers by creating individual programs with their further correction in the process of self-development, creating scientific and research environment on the bases of personal and individual approach with the aim of compensation insufficient development of research skills; operative diagnosis and correction of development of research skills of primary school teachers in the system of postgraduate education. It is shown that the development of research skills of primary school teachers is a motivated, useful and purposeful process of quality changes in professional knowledge, skills and habits of the individual in order to obtain new competences and to increase professionalism. It is recommended creating individual perspective programs of professional self-development of a teacher in inter-course period; varied programs of development of research skills of the teachers for each category; working out of special courses that are aimed to form and develop research skills of primary school teachers; implementation of teachers’ diagnosis in order to identify the problems of their development and means to solve these problems in the course period; creation and application of new forms and means to involve teachers in the process of acquiring knowledge and developing their skills. It is emphasized that the effective development of research skills of pedagogues in establishments of system of postgraduate pedagogical education was possible only in conditions of changing priorities from acquiring knowledge till independent cognitive activity of each participant considering his (her) peculiarities and abilities, relevant motivation, sufficient teaching and methodological, organizational and pedagogical guaranteeing. During the research it was found out the most essential reasons that hampered the process of development of research skills of primary school teachers in the system of postgraduate education. Most of them could be removed with the help of working out and creation of appropriate pedagogical conditions.