The purpose of this research is to recognize how Korean political environment affects the activity of environmental NGO. Thus, this study analyzed the relationship between Korean successive government and environmental NGO. This research focused environmental NGO as a main sector in Korean civil movement. This study analyzed Korean Federation for Environmental Movement as a delegate of environmental movement group. The research method of this paper was basically established based on new institutionalist perspective. The relationship between government and environmental NGO was independent relationship at Kim Young-sam Government period. The relationship between government and environmental NGO was cooperative relationship at Kim Dae-joong Government period. And the relationship between government and environmental NGO was cooperative relationship at Roh Moo-hyun Government period. Comparable mutual recognition between government and Korean Federation for Environmental Movement was formed at Roh Moo-hyun Government period. This phenomenon is because the relationship type between government and Korean Federation for Environmental Movement at the former Kim Dae-jung Government period lasted. In terms of historical institutionalism, the sustainability of relationship type is due to the characteristics of path dependency and stability which institutions related to environment contain. Finally, the relationship between government and environmental NGO was dominant relationship at Lee Myung-bak Administration period.