The purpose of this study is to clarify the framework of regional environmental treaty and policy in the Baltic Sea region in its entirety. The cooperation in the Baltic Sea is a pioneer case of a regional environmental political regime process and the Joint Comprehensive Environmental Action Program (JCP) for reduction of the pollution load and aims to cooperate on environmental conservation for the Baltic Sea. The regional scientific communities in the Baltic Sea region, who regional experts are allowed to participate and exchange views, have contributed to a new political regime and the structural form of environmental cooperation in the region. The political regime of environmental cooperation in the Baltic Sea is developing from after cold war 1990 s. This structure is different from that of North-East Asia (among Japan, Korea, and China). This is for the following reasons: 1. There is the tendency which frictions among North-East Asia countries discourages. 2. Cooperation among Baltic Sea states aims to increase the awareness of Polish and Baltic State municipalities and NGO on Baltic environmental political regime which is nothing in North-East Asia. In this paper I have tried to show that the current situation of the regional treaty in North-East Asia is significant of importance when maritime issues are discussed with the aim to build a framework for regional environmental preservation.