With transition of the national security strategy of the United States after “9.11”，the Bush administration made a series of important adjustment in its Africa policy by taking counter-terrorism as the priority. Considering the existed position of Africa in the U.S. foreign policy and some realistic elements，the Obama Administration had more inherited from Bush’s Africa policy than adjusted in its first term. While maintaining the policy stable，Obama has also worked to change the U.S. Africa policy somewhat，characterized of：counter-terrorism as the top agenda，economic cooperation as the lead and investment for the future interest. The U.S. government has launched a series of policy initiatives and received expected effect，which has improved the strategic position of Africa as well. In the near future，strengthening the coordination on work of Africa and taking precautions against China in Africa will be the main points of the U.S. Africa policy.