This thesis is a study on the treatment of juvenile pre-delinquent in R.O.C.. The word “treatment” has various meanings, such as punishment, education, protection, and correction, so that it is the very word to describe our country’s policies about juvenile pre-delinquent. There are six chapters in total. The first two chapters introduce (1) what motivated the author to begin this study, (2) what juvenile delinquency is, and the juvenile legal system in other countries. The next three chapters discussing the treatment of juvenile pre-delinquent in R.O.C , which are the core of this thesis, firt connect Criminal Law with the juvenile legal system and the legal juvenile procedures. Then discuss wheather it is proper that the legal system deals with the juvenile pre-delinquent, and turn to introduce the government policies about the juvenile pre-delinquent . The last chapter comes the conclusion of this thesis.