WASHINGTON — Recent satellite analysis and U.S. assessments show China has expanded secretive nuclear-related sites in Sichuan province in recent years, especially around Pingtong and Zitong, as Beijing works to support a larger and more responsive nuclear force. Satellite imagery cannot by itself measure how many extra warheads China can produce, but analysts say the mix of new industrial buildings, safety infrastructure and supporting works increasingly points to a wider capacity to make, move and maintain warhead components, April 4, 2026.
The clearest public reporting so far comes from a New York Times interactive report and a Washington Post investigation, which described sustained upgrades at Sichuan sites tied by outside experts to warhead-related work. Their reporting stops short of claiming a known production number, but it strengthens the case that China’s expansion is no longer centered only on missile silos and launchers; it also appears to involve the industrial network needed to arm a larger force.
Why the China nuclear buildup matters now
The bigger concern is scale and speed. In its 2025 China Military Power Report, the Pentagon said China’s stockpile remained in the low 600s through 2024 and that the People’s Liberation Army is still on track to field more than 1,000 warheads by 2030. The same report said China probably made progress toward an early warning counterstrike capability similar to launch-on-warning and likely has loaded more than 100 of its new silo-based intercontinental ballistic missiles.
SIPRI’s Yearbook 2025 release likewise said China now has at least 600 nuclear warheads and has been adding roughly 100 a year since 2023, faster than any other nuclear power. A separate Reuters special report on China’s growing nuclear arsenal noted that Beijing still publicly frames its posture as defensive and says it adheres to a no-first-use policy, even as U.S. officials and outside experts warn the force is becoming larger, more diverse and more usable in a crisis.
What analysts say the Sichuan sites could mean
That is what makes Pingtong and Zitong more important than they might first appear. Outside analysis has increasingly associated Pingtong with plutonium pit production or related warhead-component work, while work in Zitong has been described as consistent with high-explosive or other hazardous processes used in warhead fabrication. In plain terms, these are the kinds of functions that help turn fissile material and design expertise into fieldable weapons.
None of that means satellite photos alone can prove China is producing a specific number of extra warheads. But if the sites are performing the roles analysts suspect, then the construction underway in Sichuan would matter because it expands the physical base required to assemble, refurbish, move and support a bigger arsenal at higher readiness.
China nuclear buildup in Sichuan did not start overnight
The trail has been visible in open sources for years. A 2020 geospatial assessment of Pingtong argued that the facility had already expanded enough to improve China’s capacity to produce more finished nuclear weapons. In January 2025, Reuters reported on a giant laser-fusion research center in Mianyang that experts said could aid nuclear-weapons design without live testing. Then a May 2025 VERTIC analysis newly pinpointed a likely nuclear-associated complex north of Mianyang and noted that Sichuan’s valleys and mountains fit the old logic of burying the most sensitive work deep inland.
What comes next
China remains well below the U.S. and Russian nuclear stockpiles in absolute numbers, but the story is no longer only about closing a numerical gap. The emerging question is whether Beijing is building an end-to-end nuclear enterprise — from silos and submarines to inland production and assembly sites — that can sustain a much larger force for decades.
That is why the Sichuan sites matter. Even without direct evidence of exact output, their expansion suggests China’s nuclear buildup is moving deeper into the industrial layer that underpins long-term warhead production capacity. If that reading proves correct, future arms-control talks will become even harder, because Washington will be less likely to treat China as a peripheral nuclear power while its launchers, readiness systems and suspected production network keep growing together.
