The purpose of this study was to compare family dynamics in child maltreating families (n=42) with that in ordinary families with children (n=77), and to ascertain risk factors of child maltreatment within the family. Child maltreatment was defined as physical, psychological or sexual abuse or neglect of a child by a parent. Data were collected using questionnaires (Family Dynamics Measure 2, FMD 2) (N=119) basing on Barnhill's conceptual framework of healthy family systems and analysed by forming sum variables and logistic regression. The study results indicate that family functioning in child maltreating families is lower on all dimensions of family dynamics (individuation, mutuality, flexibility, stability, communication and roles) than that in ordinary families with children. Furthermore, it seems that specific risk factors, detected with logistic regression analysis, are related to whether child maltreatment occurs in the family or not. These include the parent's low educational background, many children in the family, unemployment of a parent, low individuation of the family members, and poor stability and security within the family. The results of this study provide guidelines for detecting and preventing child maltreatment as well as for recognising its existence, although no generalizations can be made due to the small sample size and complexity of the phenomenon under study.