The fulfillment of the obligation of guarantor is of great significance to development of resources and environmental protection in the international seabed area. In this paper, using semantic analysis, logical analysis, comparative research, and the United Nations Convention on the Law of the Sea and relevant legislation as basis, combined with the advice from International Tribunal for the Seabed Dispute Chamber of the obligations of the guarantor on the international seabed security, we discussed the nature of obligation, content, form of performance and performance differences between different countries. Through the analysis, it is pointed out that the guarantee obligation belongs to the obligation of conduct, and the guarantor shall adopt the laws and regulations and take administrative measures to ensure that the performance of the guarantee obligation is “diligent”. In view of the gaps of developed and developing countries fulfilling their guarantee obligations, conditional differential treatment should be given to encourage developing countries to strengthen capacitybuilding and participate more effectively in “The Area” activities. In the analysis of the above related issues, submarine dispute on the Advisory Committee of the many deficiencies were analyzed in order to clarify the relevant concepts to get a better understanding of its content, which will further regulate and guide activities in “The Area”.