Sex Offender is targeted the disadvantaged in society such as women and children, and devolved into a serious crime such as murder, robbery and in the risk of repeat offending. So It is recognized as a highly social attention by press and people. Releasing identies in particularly pedophilia prevent recidivism control and several institutions for 2010 before and after as the tsunami began to be put into effect as innovative as to our country. Like child rape cases is subject to murder occurred and only one case even if there is a case which leads to big issue in society, including the media. Each time, by the public opinion by around 2010, releasing identies for especially pedophilia and Electronic monitoring system and Drug treatment for sex offender were introduced. Releasing identies for pedophilia which was launched in the end for many of those arguments must have to coolly evaluate the impact of the prevention of sex offender. Such about the severe punishment is need to evaluate the ineffectiveness on the one hand, and th effectiveness to adopt the other hand. The existing law shows many problems of the subject of extensive regulations, judgments excluding the risk of repeating crime and a dualistic structure of the registration organization and operational organization. Above all, question is that goal of releasing identies especially for pedophilia is effective for preventing the second crime of sex offender. For the newly introduced releasing identies system in order to achieve that purpose, it will be in effective under condition of the shrinking of the crime that target, the new regulation of the court judgment of evaluation of the risk of repeating and step-by-step implementation in proportion to risk of repeating and unification of dualistic structure of the registration organization and operational organization.