Vietnam has a long coastline and a large sea area with many islands and two archipelagos of Hoang Sa and Truong Sa. Therefore, the central goal of Vietnam in the process of building and developing the country is protecting the integrity of its territory, sea area and airspace. In particular, Vietnam always attaches importance to cooperation with regional countries to carry out this task. According to the 1982 United Nations Convention on the Law of the Sea (UNCLOS), the boundaries of Vietnam's exclusive economic zone and continental shelf are expanded and adjacent to many countries. Besides the sea areas that have been clearly demarcated with Thailand and Indonesia, Vietnam is still in negotiation with China, Cambodia and Malaysia about remaining sea areas. In order to create a legal basis for the management and exploitation of its sea areas, contribute to creating a common security and order environment at sea and international maritime, consolidate and develop friendly and cooperative relations with other countries, Vietnam and neighboring countries have been cooperating in negotiations to sign maritime delimitation agreements. Typical of these is the cooperation in maritime boundary delimitation between Vietnam and Malaysia. This article aims to present and analyze the cooperation on maritime delimitation between Vietnam and Malaysia from the perspective of international studies.