The main goal of the paper was to analyze the impact of psychoeducation in alcoholism therapy treatment on initial motivation and comprehension, change in attitudes to alcoholism, and beginning of creating a new value system. The sample consisted of 166 respondents (83 married couples) that had been involved in one-year systemic group family therapy alcoholic treatment (with the man being alcoholic). A questionnaire on knowledge about alcoholism was used. The respondents were tested three times - at the beginning of the treatment, after 6 months, and after one year. The results showed that the level of education had increased through three phases of the treatment, that motivation changed from initial to substantial, that the comprehension had also changed, turning family system into a more functional model of living. Statistically significant difference in level of education between phase 1 and phase 3 of the family therapy was confirmed. In conclusion, the authors argue for the importance of psychoeducation as a method in treating alcoholism.