The global capture fisheries trends continue to rise and have shown an overfishing behavior in several parts of world’s water. The IUU fishing activities have increased which threaten the sustainability of fisheries resources and marine environment. Indonesia suffers from IDR 8.7 trillion losses due to illegal fishing conducted by foreign fishing vessels. The purpose of this under graduate thesis is to explain how Thailand resolves the problem of IUU or illegal, unreported and unregulated fishing in cooperating with Indonesia to analyze the agreement and Indonesia law enforcement toward to the problem. The result of the cooperation between Thailand and Indonesia is both of them draft the agreement for sign the Memorandum of Understanding on Fisheries Cooperation Committee on Fisheries Cooperation.