This study tried to explain the long-term effect of incarceration at the time of youth, and to suggest suitable treatments to prevent recidivism. For the research, a sample of 233 inmates who were within 6 months of release and over 2 years of incarceration were recruited at the 9 prisons. The main findings are the followings: First, inmates who were incarcerated as a youth (as younger they were at that age) had difficulty adapting to their families and the society. It seemed that they needed the constant observation and the support in their adaptation period. Secondly, inmates incarcerated in juveniles had a much higher and a more violent crime rate compared to the inmates incarcerated at the time of adult. Early state juvenile inmates needed an active assistance to prevent recidivism. In third, statistics showed that even though occupation training rate was high, few inmates had certificates among the inmates incarcerated in juveniles. It seems that there should be more motivative programs to make inmates more comfortable in participating in training programs. In forth, since most of the inmates are concerned about their life after their release, it is becoming important that there should be a more efficient program regarding the prevention of recidivism and widening the possibility of past inmates to getting employed.