Military spending is the reflection of national military strategy in numbers，the economic foundation of national defense and army building as well as a major symbol for a country’s comprehensive national power and national defense forces.The change of military expenditure，increase or decrease，is closely linked with international strategic structure，national security environment，warfare and economic development.The outbreak of global financial crisis in 2008 made the whole world fall into an economic recession；however，global military spending rose sharply instead of falling.The main reason is that some countries try to solve the thorny issues they face in the “war on terror” through military means.The increase of military spending leads to acceleration of arms race，which tells the growing insecurity of the international society that countries seek to defend themselves by expanding and upgrading military forces.The reality that today’s world is far from safe has brought about negative impacts on global security and stability.