Abstract: The principle of transboundary liability plays an important role in protecting environment. The used of the principle of transboundary liability to the area of the environmental protection with the interest approach largely in reply to the necessity of every each person to protect, their rights and interests in property from being polluted. Therefore, this study will examine the used of the principle of transboundary liability in relation with interest approach from the international legal perspectives, identify actions and cases which deal with environmental protection and also identify the relation between the principle of transboundary liability and interest approach as a means to protect environment.