The Issue of international security has long been playing a significant role in the research of international relations. There are three major Western theories on international security, namely, realism, liberalism and constructivism. As a key component of the doctrine of the Community of Shared Future for the Mankind, the Theory of Overall National Security, which is mainly characterized by mutual, comprehensive, cooperative and sustainable, benefits from the classic Chinese culture and keeps the above Western theories for reference while abandoning their dross, has been receiving worldwide attention. The Theory of Overall National Security provides the international relations in the 21^st century with new visions owing to its foresight and progressiveness. With transcendence over major Western theories on international security, the Theory of Overall National Security should be internalized and put into action, and only in this way can the perpetual peace and security for the entire international community be achieved and maintained.