The research aims to explore the reasons why children become the juvenile domestic violence and sexual offender, as well as discover these children’s service needs and the limitation and responses of intervention services. For the purposes, by adopting qualitative approach, 4 child and youth protection social workers’ opinions were collected from a focus group. It is found that the reasons why juveniles become domestic violence and sexual offenders are closely related to the poor family function and adolescent development issues. These juveniles’ needs for the social services thus should include: healing emotional trauma, helping the juveniles and their parents to learn how to cope with conflicts, and understanding the juvenile s’ sex curiosity and intimate relationship needs. Based on these service needs, it is necessary to involve the parents or juveniles’ family caregivers in the service, make good use of group work, focus on the juveniles’ needs, enhance the professional ability of practical workers and integrate the relative service resources when planning the intervention services for the juvenile domestic violence and sexual offender. Based on these findings, the research puts forward several suggestions for reference of related policies and practical works.