The aim of the paper is to present facilitating and hindering factors of psychotherapy supervision. Findings are based on author’s doctorate research, which is mostly qualitative, based on the paradigm of significant events and qualitative design of helping factors. In the research, 62 respondents participated, 50 supervisees and 12 supervisors, from different theoretical orientation. The questionnaire of significant aspects in supervision has been used. After receiving the questionnaires, we have interviewed ten supervisees. Important facilitating factors of supervision are connected to the supervisor, supervisee or supervision group. Hindering factors are the rupture in the supervisory alliance, some characteristics of the supervisor and the supervisee and dysfunctional dynamics in the supervision group. Nondisclosure in supervision could be hindering, too. In the presentation we will present facilitative and hindering factors more in detail. Supervisory process is also influenced by contextual factors such as developmental level of supervisee and supervisor, gender, the form of supervision etc. We’ll present the models based on the research, which can be used in the supervision. One of the most important processes of the supervision, found in the research, is affect regulation. The author suggests affect regulation as »the fourth« important function of supervision.