With concentration on normalization of Eco-Friendly Attitude, environmental identity and Eco-Friendly Consumption Behavior, this paper studied the factors affecting Eco-Friendly consumption behavior. In the study, an online questionnaire was conducted among 339 consumers living in Seoul. The analysis methods include technical statistics, credibility analysis, factor analysis, t-test analysis and F-test analysis, correlation analysis, regression analysis. The main findings are as follows: 1. Through the analysis of the causes of Eco-Friendly consumption practices, four factors are obtained: purchase, use/disposal, citizenship, and automobile use. 2. According to the demographic characteristics, studies are taken on whether there are differences in the practice of Eco-Friendly Attitudes, environmental identity, general cognition and Eco-Friendly consumption behavior. Depending on gender differences, results show that there were meaningful differences in general cognition and practice. There were meaningful differences in Eco-Friendly Attitude, environmental identity, purchase, use/ disposal, and level of civic action depending on age. Depending on the marital status, differences exist in the degree of environmental identity and public sexuality practice. Depending on the level of education, meaningful differences appear in the level of general awareness in purchase, use/processing and the level of practice in use/disposal. 3. Age, normalization and environmental identity are important factors on the practice of Eco-Friendly buying behavior. Age, normalization and Eco-Friendly Attitudes have a meaningful impact on environmental identity in the practice of pro-environment use/ disposal behavior. In the practice of automobile use, behavior and related Eco-Friendly behavior, universal consciousness, Eco-Friendly Attitude and environmental identity have a meaningful impact. On the level of civic action and related Eco-Friendly consumption behavior Age, normalization and environmental identity have a meaningful impact. Generally, in demographic characteristics, only age plays an impact as a meaningful variable. Normalization and environmental identity have a meaningful impact on practical behavior, while Eco-Friendly Attitudes play an important role in the use/disposal and use of automobiles.