British defense policy stressed: "ensure that the territorial integrity and security of the UK and its territory; deal with Britain and its allies faced any significant external threat; promote British broader security interests through the maintenance of international peace and stability ." Under the guidance of this policy, the United Kingdom established a set of effective national defense mobilization system and regulations, and formulated a series of relatively complete national defense mobilization plan and measures. This article firstly introduces the leadership system of the country's national defense mobilization, including the mobilization in highest decision-making body, army system and cabinet system; then introduces the country's national defense mobilization system, including active duty Army mobilization system, the reserve system, the mobilization plan and mobilization regulations; at last, it introduces the basic measures to mobilize the country, including strengthening the completion of mobile system, strengthening the strategic material reserve, enhancing the reserve mobilaztion, paying attention to the long-time steady mobilization. <<