DF-21 is China in the 1980s at the end of the development of successful mobile medium range ballistic missile, is the people's Liberation Army first solid fuel ballistic missiles, in the preparation of the Second Artillery Corps, a milestone in the history of the development of the second artillery. The latest modification by adding a variety of warheads to decoy anti missile system to intercept, and close to the cruise missile attack accuracy. The missile to the United States is designed to intercept the sea skimming cruise missile system, the flight altitude is too high; for the purpose of dealing with other ballistic missile defense system is too low. And even to intercept one to two, while the launch of a number of the missile can achieve operational objectives, and thus become the most advanced weapon in the pla.