Playing truant and running away from home are the most common delinquency-prone behavior of juveniles. This study is to investigate the juvenile runaways’ family backgrounds, social resources, life experiences and runaway experiences, and to analyze the causes of the runaway behaviors, and then to propose the improvement of judicial treatment and guidance strategies. By using the self-edited Questionnaire of Juveniles’ Runaway Experiences, the researchers made a survey on the juvenile delinquents and the delinquency-prones pronounced by Kaohsiung juvenile Court from April to July in 2003, and also on the runaways not passed to court by sending questionnaires to the high schools in Kaohsiung County. Eventually, 390 effective samples were collected, which belonged to three groups for analysis and comparison: 92 pure juvenile runaways (not delinquents) included in the first group, 111juvenile delinquents without runaway behaviors included in the second group, and 187 juvenile delinquents also with runaway behaviors included in the third group. The findings of this study were as follow: (1) The divorce rate of these juvenile runaways’ parents was much higher than that of general families. They were also caregived by their fathers more. The social and economic status of these families was obvious low, and about one-third of the families were poor. The juvenile runaways also had poor relationship and interaction with their family members. (2) A very high percentage (about 70% to 80%) of juvenile runaways had good friends with runaway experiences. Also, where the runaways usually stayed was internet café, and they also had more companions in internet café or more friends made on internet. (3) Poor family interaction and inappropriate family discipline from their parents were the major causes of the juveniles’ running away. If the parents didn’t improve their ways of discipline, the juveniles were likely to run away again. (4) When the juveniles ran away for the first time, they ran into such problems as insufficient money to spend, staying too much time in internet café, living in unsafe places, or being confined by someone, and some of them might consequentially commit crimes such as theft and illegal jobs, etc., or even become the victims of others’ crimes. (5) Although the juveniles’ running away from home is generally regarded as a kind of delinquency-prone behavior, quite a lot of the juvenile runaways felt very free and happy after they ran away, and held very positive attitude towards their running away. The findings revealed that the juveniles’ running away shouldn’t be regarded merely as a kind of deviated behavior and that the poor interaction and the inappropriate parental discipline in their families shouldn’t be neglected. The researchers suggests that the judicial agencies, if to solve the problems of juvenile runaways, should aim at their family systems. The judicial agencies should detect more about the juvenile runaways’ family backgrounds and their parents’ attitude towards discipline so as to make adequate decisions on treatment. For example, they can request the parents to improve their ways of discipline and liaise with the schools and with the community guidance institutions to provide necessary individual or family counseling and parental education for the juveniles’ parents. If necessary, they also can exert compulsory parental education on them, or make a punishment of switching the parental rights to other party.