In the recent years, the changes of socioeconomic environment have caused the increase in broken families and helpless children and youth who require interference of governmental authority. Our government has provided assistance under relative regulations to protect their personal safety, and supportive, complimentary, and developmental services. This study aimed to investigate how relative projects and philosophy concepts should be designed by facilities by adopting restorative justice to enable youths residing in delinquent facilities to reduce illegal or criminal practices through relation repair, and so verify that it is practical for management of relative events. This paper adopted research methods such as literature analysis and participant observation. In the sections of literature analysis methods, the researcher analyzed relative theories and empirical studies of restorative justice. In addition, the research also explored the relation between Christianity and restorative justice. In the sections of participant observation, the researcher conducted a field research on three residential facilities for delinquent youths and research of hypotheses that: (1) restorative justice is applicable for residential facilities for delinquent youths; (2) restorative justice enhances efficiency of residential facilities for delinquent youths; and (3) the staff of residential facilities for delinquent youths help youths to return families, schools, communities, and the society by assisting them in recovering from the conflict incidents and family traumas through restorative justice. The researcher designed eight dimensions for participant observation for this study, and then proceeded to cross-comparison between dimensional relation of the restorative justice and efficiency of the facilities. The results are: (1) In observation of the three facilities, each had more or less applied it to their projects or instructions, which varied to each other to some extent. Although sample size of observation was not large, they seemed applicable in the residential facilities for delinquent youths. Another major factor that it was not extensively employed was that the government did not successfully promote and execute this affair. (2) In analyzing the correlation and efficiency of each facility in applying restorative justice through each dimension of participant observation, it was found that the closer relation with the restorative justice the facilities had the more efficiency they performed. (3) Belief varied from the restorative justice, but they could consolidate. (4) Regarding roles assignment, the attenders of the facilities played the roles as offenders, the individuals and various social institutions took the victims, and the facilities took the communities. (5) Although cases of judicial diversion and protection were different, there may be causality between both the offenders and victims. Suggestions: (1) The necessity of promotion restorative justice exists. (2) Observation dimensions could become reference tools for relative researches in the future. (3) Belief of religion and restorative justice have same spirit and philosophy, it is recommended that they could combine. However, differences between them should be monitored.