Nowadays,juvenile delinquency,drug abuse and pollutions are recognized as the three greatest calamities.Of the three,juvenile delinquency is the focus of public attention.And it bears the characteristics of adult tacts,young age,gangs,high intelligence and violence.And it also has been becoming a social problem demanding to be soluted right away,which is threatening our public security and blocking our harmonious social development.Now it is urgent to analyze the causes of juvenile delinquency and find effective solutions.So this thesis analyzes the current situation and causes of juvenile delinquency,and puts forward some solutions by relating to the practice.