Global interest in environmental issues is increasing. Especially, the unusual climate phenomena and pollution problems on Earth, which are becoming serious in recent years, have gone beyond mere concerns. Accordingly, the Korean government has introduced various policies that take into account the environment, and many changes are taking place in consumer behavior and consciousness. However, the environmental issues are not a problem that can be solved in one country, but a problem that the world must overcome. This study was conducted on consumers in Korea and China who have environmental connections in the vicinity of the region, considering that academic research on the antecedents affecting consumers' eco-friendly behavior is necessary. For this purpose, the study examined the effects of environmental knowledge, environmental attitude, and cultural background variables on eco-friendly behavior of 210 Korean consumers living in Seoul and 198 Chinese consumers living in Shanghai, looking at differences in environmental knowledge, environmental attitudes and cultural background variables affecting eco-friendly behavior. The results of this study can be used as basic data on environmental policies in each country. It is also expected that the direction of the company's eco-friendly marketing strategy will have a positive effect.