From "The Military Power of the People’s Republic of China 2005" from U.S. DoD (
), page 35:
China currently is capable of targeting its nuclear forces throughout the region and most of the world, including the continental United States. Newer systems, such as the DF-31 and DF-31A, will give China a more survivable nuclear force.
China currently deploys approximately twenty silo-based, liquid-propellant CSS-4 ICBMs, which constitute its primary nuclear deterrent. The Second Artillery also maintains approximately twenty liquid-fueled, more limited-range CSS-3 ICBMs to sustain its regional nuclear deterrent. The Second Artillery will likely keep this older missile in service until it is replaced by the more survivable, road-mobile DF-31. China supplements the aged CSS-2s with solid-propellant, road-mobile CSS-5 MRBMs.