The purposes of this study were to understand the knowledge, attitude, self-efficacy, and behavior of green consumption of junior high students in Yunlin County and to discuss the correlations among these factors. The subjects of this study were 7th, 8th, and 9th grade students in a junior high school in Yunlin County. Four classes in each grade were randomly selected from the school. Each student was asked to complete a structured questionnaire. A total 356 questionnaires were collected. The main results of this study were as follows:1. Most subjects of the study showed positive the knowledge, the attitude, the self-efficacy, and the behavior of green consumption, as well as positive correlations toward the behavior of green consumption, respectively. Among the knowledge, the attitude, and the self-efficacy, self-efficacy toward the behavior of green consumption showed more close correlation.2. The subjects with higher self-efficacy, knowledge and more positive attitude toward green consumption, with higher level of following environmental protection policy in the family, higher family socio-economic status and more experiences of environmental protection information performed significantly better on the behavior of green consumption.3. There were no differences in the behavior of green consumption due to different gender, the frequency of going to night market every week, or the habit of eating betel nuts in family members.4. The self-efficacy, the attitude of green consumption, and the family socio-economic status could significantly explain 61% of the variances of the behavior of green consumption, and the self-efficacy was the main predictor toward the behavior of green consumption.