China's Fissile Material Report

China launched its nuclear-weapon program in 1955 and began producing HEU and plutonium in 1964 and 1966, respectively. China exploded its first fission device (HEU-based) on October 16, 1964 and detonated its first hydrogen bomb on June 14, 1967. Since its first nuclear explosion, China has maintained a nuclear policy featuring a no-first-use pledge. China ratified the Nuclear Nonproliferation Treaty on March 9, 1992. China has kept secret information about its fissile materials and nuclear weapons stocks. It is estimated that China had about 360 warheads in 2020, slowly increasing over recent decades. The U.S. missile-defense program is a major driver of China’s nuclear-weapon modernization, which includes an expansion of its nuclear arsenal and more and improved intercontinental ballistic missiles. China conducted 45 nuclear tests from 1964 to 1996 at its Lop Nor site in Xinjiang. Its last nuclear test was in July 1996. In September 1996, China signed the Comprehensive Nuclear-Test-Ban Treaty but has not yet ratified it. Most likely, China is waiting to see if the U.S. will ratify.