In this study, a model combined Theory of Reasoned Action (Ajzen and Fishbein, 1980) and Self-efficacy (Bandura, 1982) were employed. The subjects were selected by stratified cluster sampling from 7th to 9th graders of junior high school students in one city of Taoyuan county in 2013. A total of 701 effective samples were collected using a self-edited structured questionnaires.The main results of the study were as follows: 1. More than eighty percent of the subjects hold positive attitudes on waste reduction. They were willing to comply with their teachers and parents’ suggestions for waste reduction. 2. Among the questions of behavioral intention of waste reduction, the subjects showed higher willingness of behavior in reuse and recycle, but showed the lowest in refuse behavior. 3. The subjects showed lower self-efficacy of waste reduction in the situations of ＂no time＂, ＂too tired＂, and ＂too busy＂, whereas higher self-efficacy of waste reduction were presented when their teachers, parents, or peers pay attentions to this issue of waste reduction, which reveals the importance of environmental education in school and family. 4. About eighty percent of the subjects had correct cognition on waste reduction, but showed lack of knowledge in source reduction, policy and the methods of hazardous waste clearance. 5. There are positive significant correlation between gender, knowledge, school supports, family supports and behavior intention of waste reduction. No correlation was shown between the type and ownership of house and behavioral intention of waste reduction. 6. The results of this research showed the combination of Theory of Reasoned Action and Self-efficacy could successfully improve the prediction of behavioral intentions of waste reduction to 39.4% (increase by 8%). 7. The results support the hypothesis of Theory of Reasoned Action, that extrinsic variables affected behavioral intention indirectly through attitude and subjective norms.