There are many studies exploring psychological well-being, but we have not seen any studies for junor high school students in Taitung where it is the lowest development in Taiwan. We adopt the data of Taitung Educational Panel Survey in 2005 for the eighth graders and their parents, and explore the mechanism background of the eighth graders in Taitung influencing the psychological well-being through social network and academic performance by path analysis. The findings of this study are as follows:1. The psychological well-being was mainly influenced by social network rather than by family socioeconomic status and academic performance.2. In terms of the psychological well-being influenced by social network, the psychological well-being was mainly influenced by interpersonal relationship at school rather than by family relationship.3. In terms of the psychological well-being influenced by interpersonal relationship at school, the psychological well-being was mainly influenced by peer relationship rather than by teacher-student relationship.