In the 21century, the World is facing with many problems. There are many conflicts between countries, not only on land but also on the sea. Asia is now becoming the center of the world with issues related to the politic and economy. Southeast China sea is hot area now. Many countries crush each other on this sea area because of big benefit and strategy position of this sea area. Besides, problems related to nuclear and chemistry in North Korea, Iran, etc. or trade war are making conflicts between countries and danger the peace and security of the world. Moreover, the increasing of terrorism situation is also danger the peace and security of area. Therefore, the government of countries have tried to keep the peace by negotiate and co-operate each other. On this paper, I will analysis some problem related to the peace and security in Asia. Then I will analysis the regulations of international law on these problems. I will give some recommendation to maintain and promote peace and security in Asia. I will also mention the role of Vietnam and ASEAN to maintain and promote peace and security in Asia. To research and write this Paper, I use many methodologies of researching such as theoretical research methods of analysis-synthesis, methods-inductive interpretation, statistical methods, and comparative method ... to go from research the actual evolution to generalize and make a judgment general trend.