In 2011, the overall situation in Afghanistan was controllable, and showed the following characteristics: first, the reconstruction process in Afghanistan is still difficult; second, U.S. withdrawing its troops from Afghanistan faces challenge; third, the influence of the Taliban in Afghanistan continues to rise; fourth, the harm from Afghan drug continues to expand. The situation in Afghanistan has a certain impact on security in Central Asia: first, the Afghan Islamic extremist force is the challenge to security in Central Asia; second, the harm from Afghan drug to Central Asia is gradually increasing; third, U.S. withdrawing its troops from Afghanistan affects the security and stability in Central Asia. <<