The evolution of blockade over time, technological advances, have been away from the traditional blockade, and sometimes the sea powerful countries avoid to circumvent the application of blockade, and use the practices of exclusive zones and the no-fly zones as a tool to achieve its military interests. Together with the codification of international law, international custom and the needs of the international community has shaped all the text, no longer a single mode of thought to test its legality. This paper intends to investigate the blocking pattern of change in practice to serve the international trend of interest of its legitimacy, and to understand.