Contrary to the past that the task of social worker was helping the need but now days the aim of social work is improvement of people's life quality. Social work services includes: welfare services and rehabilitation services to all ages (Childs, juvenile, youth, adults and aged persons) also capable and handicapped persons (physical, psychical, mental and social). On of the aim of social work is declining social problems including crime prevention with addressing to person's social – economic status.Declining social problems is doable by awareness and identification of problematic factors in neighborhood and interaction with related agencies. The method of the research is documentary and descriptive method and it is based on social work by legal and judicial policy. The findings of research show that there is a direct relation between low social – economic status and family' s awareness. It means that awarded families usually don’t commit crimes. But knowingly or unknowingly in families with social – economic status and having poor awareness of laws commit crime. Every distinct of city should has a social worker who can communicate with local families (under the control of police and municipality). He/ she can address educational, employment, entertainment, giving legal information. And give the some opportunity and interests of society. So the reasons of committing crime were declined. Giving legal information means informing the families with criminal, civil and citizenship laws and regulations. These will be achieved when cooperation between related agencies and organizations including police, parole societies, similar administrative agencies become more and these should adapted with the aims of social work in order to solve the problems of crime and prevention.