Improvements in state compliance with international legal rules have been the focus of numerous research papers since the effectiveness of international law depends on state adherence to international legal rules. This paper uses the Managerial School, Reputational Theory, and Paris Agreement to emphasize some key points relating to existing improvement methods. The key points include rational managerial methods in the international community, the importance of reputation and information transparency, the leading of influential nations, and international institutions' roles. Results from the solutions suggest that national interests and self-regulation are central ideas of state adherence. This study also offers supporting evidence of the central ideas and investigates theoretical and practical methods to improve state compliance with international law.