Faced with a situation that heinous youth crime gave rise to public's punitive attitudes toward juvenile delinquents and the public requested harsh on juvenile delinquents policy, Canada made a decision that through “Youth Criminal Justice Act of 2002”, juveniles would be given a chance to regret their wrongdoings, make a restitution for victims, change their attitudes, gain social skills and set their life goal by participating in various diversion programs. In addition, custody became the last resort only for the serious offenders and intensive treatment programs for mentally and emotionally troubled youth would be provided. After reviewing Canadian juvenile justice system, the current study provides six police implications for Korean juvenile justice system. Enacting law for using extrajudicial measures and extrajudicial sanctions, introducing Intensive Rehabilitative Custody and Supervision for mentally and emotionally troubled youth, and Life Coching Program of PACT, and Restorative Youth Circle of Peacebuilder, expanding post-release supporting shelters like John Howard Society, and providing child-centered advanced custody setting like Youth Justice Bureau.