The aim of our research was to examine the medium and long term effects of family constellation. A follow-up study was carried out with 209 persons. A questionnaire was developed for the purpose of this study. The SPSS 10.0 statistical analysis program was applied for the elaboration of the data gained from the answers to the questionnaire. The results indicated that family constellation is effective and the changes the clients experience on the medium and long run are significant. These findings correspond to our hypotheses as well as to the results of the international research data.