Long March 10B
 | |
| Function | Medium-lift launch vehicle |
|---|---|
| Manufacturer | China Academy of Launch Vehicle Technology (CALT) of the China Aerospace Science and Technology Corporation (CASC) |
| Country of origin | People's Republic of China |
| Size | |
| Height | 70.2 m (230 ft) |
| Diameter | 5 m (16 ft 5 in) |
| Stages | 2 |
| Capacity | |
| Payload to LEO | |
| Altitude | 200 km (120 mi) |
| Mass | 16,000 kg (35,000 lb) with booster recovery |
| Payload to LEO | |
| Altitude | 900 km (560 mi) |
| Mass | 11,000 kg (24,000 lb) with booster recovery |
| Associated rockets | |
| Family | Long March |
| Based on | Long March 10 |
| Comparable | |
| Launch history | |
| Status | Active |
| Launch sites | Wenchang Commercial |
| Total launches | 1 |
| Success(es) | 1 |
| First flight | 10 July 2026 |
| First stage | |
| Powered by | 7 × YF-100K |
| Maximum thrust | SL: 8,750 kN (1,970,000 lbf) vac: 9,772 kN (2,197,000 lbf) |
| Specific impulse | SL: 301.6 s (2.958 km/s) vac: 337 s (3.30 km/s) |
| Burn time | 155 seconds |
| Propellant | RP-1 / LOX |
| Second stage | |
| Powered by | 1 × YF-219 |
| Propellant | CH4 / LOX |
Long March 10B (LM-10B, Chinese: 长征十号乙; pinyin: Chángzhēng shí hào yǐ, CZ-10B) is a partially reusable two-stage medium-lift launch vehicle developed by China Rocket, the commercial launch subsidiary of China Academy of Launch Vehicle Technology (CALT). It is the third in the Long March 10 series of rockets and is derived using technologies developed for the Long March 10A.
Similar to the heavy-lift Long March 5, the CZ-10B stages have a five-meter diameter. Like other CZ-10 variants, the kerolox first stage is powered by seven YF-100K engines. The second stage uses one YF-219 methalox engine. Like other 21st century Long March designs, the CZ-10B launches from China's southernmost Wenchang Space Launch Site.
The CZ-10B's maiden flight in July 2026 successfully achieved orbit and booster recovery, using a net-based catching system on a floating landing platform in the South China Sea. This marked the first orbital booster recovery by the Chinese space program, the second country to achieve this after the United States, and the first recovery of any rocket using a net-based system.