The social problems caused by juveniles are getting increasingly worse day by day. For a long time, scholars and experts from various professional realms have had different perspectives and actions regarding “how to specifically and effectively assist current juvenile delinquents and to help them not to sin again or not to become adult recidivists”. However, they all seemed to be lacking in specific and concrete results. This research aimed to use the special learning process and experience of unicycling activities and use them as the turning points of the crime life history theory. Through these activities, we hope to improve the juveniles’ negative self-concept, interpersonal reactions, and learning attitudes so that their low self-efficiency and resilience could be elevated, thus leading to an improvement in their deviant behavior. This research utilized a certain class of the Juvenile Correctional School and used the quasi-experimental method to engage in a comparison before and after the experiment. Also, an analysis of the control group and experimental group was used to verify unicycling activities’ effects on the juveniles under reformatory education. Besides, this research compared other classes’ different results of skill training and proved the importance of the successful experiences to the juveniles. The research results could be used to promote unicycling activities, and juvenile reformatory education, as well as being a consulting reference of correctional schools. We hope this research could stir up the creativity and passion of the consultants of crime correction and bring a positive influence on the lives of the juveniles. The following are the discoveries of this research: 1. Unicycling activities have a significant influence on the “self-concept” of the juveniles. 2. Unicycling activities have a significant influence on the “parent-children relationship” of the juveniles. 3. Unicycling activities have a significant influence on the “emotional control” of the juveniles. 4. Unicycling activities have a significant influence on the “interpersonal reaction” of the juveniles. 5. Unicycling activities have a significant influence on the “learning attitude” of the juveniles. 6. This research was similar to the results of other researches. However, we discovered that unicycling activities have a broader and deeper influence. 7. This research discovered that the juveniles’ dropout experiences, educational backgrounds, and school performances would influence the learning performance of the unicycle. The research results matched the basic hypotheses. Based on the aforementioned research discoveries, the unicycling activities as a whole have a significant influence on the self-concept of the juveniles under reformatory education. This research has the following suggestions for families, schools, the society, judiciary correction and individuals: 1. Strengthen the family’s normal functions: (1) Emphasize giving initiative help to disadvantaged families. (2) Provide multi-faced and easy-to-access assistance and resources of marriage and parent education. (3) Offer more assistance resources and access for women. (4) Promote positive and active parenting attitudes. 2. The appreciation education that teaches students according to their aptitudes: (1) Seriously consider Japan and China’s models, placing unicycling activities as a required sport item. (2) The importance of positive discipline. (3) The fulfillment of the balanced development of five branches of education. (4) Never give up any student. 3. The society should take joint-responsibility for disadvantaged and deviant juveniles. 4. Correctional institutions can offer a new opportunity to the juveniles. 5. An endeavor and persistence of never giving up.