Sea delimitation is a process of negotiation and cooperation between countries with contiguous seas, it is necessary to conduct cooperation to delimit the sea area in an equitable manner, for mutual benefits. The process of sea delimitation must be based on the international legal system of the sea, international practices and practices on maritime delimitation, especially the provisions of the United Nations Convention on the Law of the Sea 1982-UNCLOS. Vietnam and Malaysia are two countries with contiguous seas, so both sides have an urgent need to negotiate maritime delimitation, in order to ensure the interests of both sides, and at the same time contribute to preserving a peaceful environment peace and stability in the contiguous waters between the two countries as well as in the East Sea.