The purposes of this study are: First, to investigate how the juvenile delinquents in the juvenile justice process evaluate their quality of life. Second, to examining which factors influence their quality of life. To accomplish these purposes, this study used sample of 570 juvenile delinquents in Seoul, Busan, Daejeon who are in the process of the juvenile justice and used the Korean Version of WHOQOL-BREF (brief version of WHO quality of life measure). To examine this purpose, Mean, standard deviation, t-test, One way ANOVA, multiple regression were conducted. The results are as follows: 1) juvenile delinquent in the process of the juvenile justice have complex problems and needs, and their quality of life are lower than the civil in the psychological, social relations, environment domain. 2) The factors influencing their quality of life in the general domain are stigma by parent, violent, undemocratic treatment in the process of the juvenile justice, family income level. But the factors of each domain of quality of life differ to some extent. Statistically significant factors of physical health domain are violent, undemocratic treatment in the process of the juvenile justice, first arrest time, stigma by others, sex, juvenile justice process. Significant factors of psychological health domain are delinquency frequency, stigma by parent, stigma by others, first arrest time, family income level, sex. Significant factors of social relations domain are first arrest time, stigma by parent, delinquency frequency, family income level, stigma by friend. Environment is significantly influenced by family income level, stigma by parent, sex, delinquency frequency, juvenile justice process.