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Carbon dioxide contributes about 90% of global warming, which is mainly generated by residents' daily consumption activities. This article explores the factors of low-carbon consumer behavior among college students and situational factors which contribute to explain intention-behavior gap. Combined with the existing research literature and the Model of Responsible Environmental Behavior, a model of the factors of Chinese college students' low-carbon consumption behavior was constructed through a sample survey of college students in Jiangsu Province. Analysis results show that (1) College students' low-carbon behavior intention has a significant positive effect on low-carbon consumption behaviors; (2) Attitudes, emotions, and habits indirectly affect low-carbon consumer behaviors through low-carbon behavior intention; (3) Low-carbon behavior ability and habits can also affect low-carbon consumption behaviors in a direct way; (4) The study of situational factors found that policies and regulations, economic costs, goals and feedback, and social norms have a significant regulating effect in the process of low-carbon behavior intention which has an impact on low-carbon consumption behaviors; (5) In terms of demographic factors, gender and education have a significant effect on low-carbon consumption behavior. Finally, this article discusses the policy measures to guide college students' low-carbon consumption behavior from the government and the school level, respectively, and place a high hope on college students who can positively influence the entire social group to carry out low-carbon consumption and achieve the realization of China's low-carbon goals.