Abstract: The primary purpose of this study is to explain the influence of interest approach, which included costs and benefits approach in the international environmental governance on regards of the Montreal Protocol�s early negotiations and the relations of the interstates participation response. Meanwhile, the methods of this study are based on qualitative set up, which is based on the meetings� proceeding reports of the Montreal Protocol. Finally, the results potentially provide with better understanding of the influence of interest on costs and benefits approach in the international environmental governance.