Picture of China's DF-5 ICBM Silo

[Martian]

Picture of China's DF-5 ICBM Silo

Chinese Military Modernization | IMINT & Analysis

"STRATEGIC FORCES

China's strategic nuclear deterrent relies on the use of land-based and submarine-launched nuclear missiles. A number of Harbin H-6 (BADGER) bombers, copies of the Russian Tu-16, are also in service, but their age and expansive RCS precludes them from any serious nuclear warfighting apart from use as standoff cruise missile platforms. The primary Chinese ICBM currently in service is the DF-5 (CSS-4). The DF-5 is deployed in well-concealed silos around China. The DF-5 was initially trialled at the Shuangchengzi missile test facility, being pad-launched.
...
Modern road-mobile ICBMs like the DF-31 and DF-31A are trialled at the Wuzhai test center. Wuzhai also contains an ICBM silo used for test launches of the DF-5 (CSS-4) ICBM in a manner more akin to operational employment than a Shuangchengzi pad launch. The first silo launch of a DF-5 took place at Wuzhai on the 7th of January in 1979."

The following image is an overview of the Wuzhai test facility:

The following image depicts the northern launch facilities at Wuzhai, containing the DF-5 silo and a possible mobile ICBM launch pad:

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According to the Pentagon 2015 Report on Chinese Military Power, the Chinese DF-5B ICBM (aka CSS-4 Mod 3) carries MIRVs.
Source (p. 8): Military and Security Developments Involving the People’s Republic of China 2015 | Department of Defense
"...and multiple independently-targetable re-entry vehicle (MIRV)-equipped Mod 3 (DF-5)"

According to expert Richard D. Fisher, China's DF-5B ICBM carries 8 MIRVs.
Source: China Increases Its Missile Forces While Opposing U.S. Missile Defense | The Heritage Foundation
"Modifying these DF-5s with an eight-warhead MIRV bus increases the number of nuclear weapons carried by its DF-5s from 26 to 208."
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Eight known Chinese DF-5A/B ICBM brigades

1. Luoning/Luoyang (804th brigade)
2. Wuzhai (Base 25)
3. Xuanhua
4. Tongdao (805th brigade)
5. Lushi (801st brigade)
6. Jingxian (803rd brigade)
7. Jingxian (814th brigade)
8. Hunan (818th brigade)

Assuming all eight brigades have been upgraded to DF-5B ICBMs (or will soon be fully upgraded in the near future):

8 DF-5B brigades x 12 DF-5B ICBMs per brigade x 8 MIRVs per DF-5B ICBM = 768 Chinese thermonuclear warheads

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References:

DF-5 | Federation of American Scientists
PLA Second Artillery Corps | Air Power Australia (54th and 55th bases)
MULTIMEGATON WEAPONS | Johnston Archive

 

[Martian]

China's DF-5B ICBM (aka DF-5 Mod 3) is equipped with 8 MIRVs per missile

China's DF-5B ICBM (aka DF-5 Mod 3) is equipped with 8 MIRVs (at a half-megaton per MIRV) on each missile.
Pentagon's 2015 Report on Chinese Military Power (page 8): "the silo-based CSS-4 Mod 2 and multiple independently-targetable re-entry vehicle (MIRV)-equipped Mod 3 (DF-5)."
Source: http://www.defense.gov/pubs/2015_China_Military_Power_Report.pdf