Child sexual abuse is a form of very brutal and nasty crime where a vulnerable and defenceless children are targeted. Statistically, child sexual abuse accounts for about 5.9% of all sexual abuses where 1,175 cases had occurred in 2010. Since only about 16% of the total population are children, number of occurrences is not a big problem. However, second conviction rate for child sexual abuse is 59.2%, that is,20% higher than the general sexual abuses. In other words, child sexual abuse is one of the high second conviction crimes. all things, child sexual abuse is problematic in a sense that it poses great harm on abused child's life and body. Also, because child sexual abuse leaves psychological trauma that is difficult to cure even after the child matures, it must be rooted out.common characteristic of the child sexual abuse offenders can be described as pedophilia. This condition is usually the result of inferiority complex arising from failed interpersonal relationships. In look out for sexual partner after the loss of confidence by failed relationships with adult female,they end up selecting the easy, defenceless children as their targets.sexual abuse offenders can be categorized into 3 types: regression, permanent, sadism. Regression type is where one has not yet entirely given up on relationships with adult female but has, in large portion, regressed to pedophile. Permanent type is someone who entirely gave up on normal sexual relationships and became a complete pedophile. The most serious and dangerous type is sadism where one does no longer satisfy from oppressive intercourses and discovers his superiority and satisfies through inflicting pain on others.of what type they are, they all have inferiority complex which they have gained from failed interpersonal relationships. It is this inferiority complex why they strategically choose children for their crimes. Because of their inferiority complex, they possess a danger of becoming outrageous when children intensely resist and end up killing or seriously injuring them. Such physical damage along with psychological trauma is the common characteristics of child sexual abuse cases.because children have difficulty resisting against sexual abuses due to their physical inferiority, they require high level protection. In the same manner,people who lack defence ability due to mental retardation also requires the same kind of protection. Therefore, the concept of child should include not only physical age but mental age as well. Therefore, a person under the physical or mental age of 13 should be considered as at-risk child.children, including those mentally retarded,become the targets of child sexual abuse because they can easily be oppressed. In order to turn this table around, the condition has to change so that the children are no longer considered an easy-target. The solution can be summed up to 4 ways in which prevent the approach of potential offenders toward the children:① electronic monitoring system, ② publication of identities, ③ loss of parental rights, and ④ restriction on employment.the other hand, children should also be prevented from being left alone with no protection. In order to do this, ① legislating the prohibition of guardian's act of leaving children alone, ② making guardian accompaniment of children when returning home a legal obligation, and ③ system for outside monitoring on the facilities for handicapped are necessary. Furthermore, there is a high chance of child sexual abuse victims receiving additional damages from the society even after the actual crime. The most important thing to do to prevent such secondary damage is to ① keep the case confidential. Also, ② child sexual abuse special investigation unit should be formed so as to avoid intrusion from investigation agency. Likewise, because children have difficulty responding during the investigation or the trial, ③ victim's attorney system should be incorporated. Lastly, ④criteria-based content analysis(CBCA) should be adopted to prevent offenders from avoiding punishment due to lack of children's credibility even when the sexual abuse had actually occurred.