The aim of the study was to investigate the effect of online social support on secondary vocational students' life satisfaction, and further explore the effect of belief in a just world as a cognitive factor and gratitude as a emotional factor between them. And a survey was conducted to examine the relationship among online social support, belief in a just world, gratitude and life satisfaction. The participants were 656 secondary vocational students; and four questionnaires were used in this study: Online social support questionnaire, belief...