Long March 12

CZ-12

On 26 February 2024, the China Aerospace Science and Technology Corporation (CASC) released its annual "Blue Book" which detailed the company's launch plans for the coming year; one of the projects revealed in the Blue Book is the new Long March 12 medium-lift rocket. Long March 12 (CZ-12) is designed as a two-stage rocket: its first stage is powered by four YF-100K 1250 KN engines using RP-1 and liquid oxygen while its second stage is powered by two YF-115 180 kN engines also using RP-1/LOX. The rocket offers two payload fairing choices, one with a diameter of 5.2 metres and another with a diameter of 4.2 metres.

CZ-12 has a stage diameter of 3.8 metres, a first for China. It is launched from the new commercial launch site located at China's coastal spaceport in Wenchang.

The maiden launch of the new rocket occurred at 14:25 UTC on 30 November 2024 from the Hainan International Commercial Aerospace Launch Site. There were two payloads on the launch: the “Satellite Internet Technology Test Satellite” and the “Technology Test Satellite-3”. Notably, this launch featured the new YF-100K rocket engine in its initial orbital launch attempt; the engine is a critical component of the under-development superheavy-lift Long March 10 lunar rocket. In addition, the maiden launch of the CZ-12 also constitutes the debut launch from the new Hainan commercial launch site.

CZ-12A reusable variant

SAST introduced a variant with a reusable first stage: the Long March 12A (CZ-12A) on 23 December 2025. The initial attempt to recover the first-stage of the new rocket during its December 2025 first flight was not successful although the rocket successfully placed a mass simulator in orbit. The CZ-12A employs rocket engines based on methane for fuel and liquid-oxygen for the fuel's oxidizer; the CZ-12A's methane-based first-stage engines are built by commercial providers.

CZ-12B reusable variant

The China Aerospace Science and Technology Corporation Commercial Rocket Co., Ltd. (CACL) is also developing a more powerful variant of the CZ-12A carrier rocket, currently known as the Long March 12B. CACL is an R&D and operations oriented commercial joint venture that appears to operate under the state-owned China Aerospace Science and Technology Corporation (CASC). A static fire test of the CZ-12B first stage took place on 16 January 2026 at the Dongfeng Commercial Space Innovation Test Zone within the Jiuquan Satellite Launch Center, northwest China; first launch of the rocket is anticipated to occur in 2026.