The objective of the study is about educational environment of young adult homeless. The study design combined qualitative and quantitative approaches and sample consisted of 90 homeless persons (60 were males) in age 18 to 26. Large majority of the young adult homeless grow up in an incomplete family (47%). Developmentally disadvantaged are especially those who lived in a state institution (34%). Over one third of the subjects reported serious physical punishment or abuse in the family. Dysfunctional family of origin, physical abuse and other forms of traumatic events in childhood are main causes of homelessness of young people in Prague.