This study explored the relationships among well-being, social support and bullying behaviors for junior high school students. The junior high school students in Taiwan were the subjects of this research. The total returned questionnaires were 1262, the returned rate of the questionnaires had reached 97% of effectiveness. The data was analyzed by descriptive statistics, t test, one way ANOVA, Pearson correlation, and stepwise multiple regression. The major findings of this research were as follows： 1.The highest rate of well-being was “Life Satisfaction”. The highest rate of social support was “Peer Support”. 2.The highest rate of bullying behaviors (bully & bullied) was“Verbal Bullying”, followed by “Relation Bullying”. 3.There were significant differences in the gender about “Self-affirmation” of well-being and bullying behaviors (bully & bullied), with more males than females. 4.There were significant differences in the gender about social support and “Peer Support” of it, with more females than males. 5.There were significant differences in the grade about social support and well-being, with more the seventh grade students than the ninth grade students. 6.There were significant differences in the grade about bullying behaviors (bullied), with more the eighth grade students than the seventh grade students. 7.There were significant differences in the grade about bullying behaviors (bully), with more the ninth grade students than the seventh grade students. 8.Well-being was positively related to social support of junior high school students. Both of them were negatively related to bullying behaviors (bully & bullied). 9.“Life Satisfaction” and “Mind Health” of well-being, “Peer Support” of social support, males and the eighth grade students could predict bullying behaviors (bullied) obviously. 10.“Mind Health” of well-being, “Teacher Support” and “Family Support” of social support and males could predict bullying behaviors (bully) obviously. Based on the above findings, some suggestions were made for the junior high school parents, teachers and counseling practices as well as the future studies.