The 6,500-ton Type 092 Daqingyu (US Department of Defense designation Xia-class, Chinese designation 09-II) submarine was the first ballistic missile-carrying, nuclear-powered submarine class (SSBN) deployed by the Chinese People's Liberation Army Navy, and the first SSBN designed and built in Asia. She was designed by Huang Xuhua, and derived from the Han-Class SSNs, with an extended hull to accommodate four missile tubes.

The first Changzheng 6 (# 406) of its class was laid down in 1978 at Huludao 120 miles North-East of Beijing; she was completed in 1981. She then spent 6 years being fitted out and conducting tests with its 12 JL-1 (CSS-N-3) missiles, becoming active in 1987. Later, the submarine went through numerous upgrades in incremental step, including using Type H/SQ2-262B sonar manufactured by No. 613 Factory replacing the original Type 604 sonar on board.

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