A History of China’s Orbital Launch Vehicles

The Long March

From the launch of a simple radio satellite in 1970 to operating a permanent, multi-module space station and landing rovers on Mars, China’s journey into space has been defined by its launch vehicles. This capability was not acquired overnight. It was built over decades, marked by early reliance on foreign designs, a period of determined self-sufficiency, high-profile failures, and a recent explosion of both state-led and private innovation. The story of the Chang Zheng, or Long March, rockets is the story of China’s rise as a 21st-century space power.

The Foundations of a Space Power

China’s rocket program, like that of the United States and the Soviet Union, was born from military necessity in the shadow of the Cold War. The program’s origins are inseparable from one key figure: Qian Xuesen. Educated at MIT and Caltech, Qian was a co-founder of the Jet Propulsion Laboratory (JPL) and a leading rocket scientist in the United States. Following the rise of McCarthyism, he was accused of communist sympathies, stripped of his security clearance, and held under house arrest for five years. In 1955, Qian was deported to China in exchange for American prisoners of war from the Korean War.

His return was a pivotal moment for Chinese science. He was immediately placed in charge of developing a ballistic missile program. Initially, this program relied heavily on Soviet assistance. The Soviet Union provided technical specifications, training, and even reverse-engineered copies of the R-2 missile, itself an enhancement of the German V-2. This led to China’s first missile, the Dongfeng-1 (DF-1).

This period of cooperation was short-lived. The Sino-Soviet Split in 1960 marked a sudden and complete withdrawal of Soviet experts and support. China was left on its own, with incomplete blueprints and a fledgling industrial base. This event forged a national policy of zìlì gēngshēng, or self-reliance, that would define its space and technology efforts for decades.

Throughout the 1960s, Chinese engineers worked to master the technologies they had been taught and to innovate beyond them. This effort produced the Dongfeng (East Wind) series of intermediate-range and intercontinental ballistic missiles (ICBMs). The program progressed from the DF-2 to the DF-3 and then to the DF-4. It was this DF-4, a two-stage ICBM, that was chosen to become China’s first satellite launcher.

From Missile to Rocket: The Long March 1

To convert the DF-4 into a space launch vehicle, a third stage was needed. Engineers developed a small, spin-stabilized solid-propellant motor to provide the final push to orbit. The resulting rocket was named the Chang Zheng 1, or Long March 1. It was a modest rocket by superpower standards, but it was entirely China’s.

Its payload was equally symbolic. The satellite, Dong Fang Hong 1 (The East Is Red 1), was a simple sphere weighing 173 kilograms, heavier than the first satellites of the USSR, US, France, and Japan combined. Its primary mission was political: to orbit the Earth broadcasting the patriotic song “The East Is Red.”

On April 24, 1970, a Long March 1 rocket lifted off from the newly built Jiuquan Satellite Launch Center in the Gobi Desert. The launch was a complete success. As the faint melody transmitted from orbit was played in communes and cities across the country, China announced its arrival as the fifth nation to independently launch a satellite, a powerful propaganda victory during the turmoil of the Cultural Revolution.

The Long March 1 was a foundational achievement, but its limited power and solid third stage made it unsuitable for more serious orbital applications. It flew only twice, launching one more satellite in 1971. The future of China’s space program would be built on a much more powerful missile: the DF-5.

Building the Workhorses: Long March 2 and 3

The DF-5 was China’s first true ICBM. It was a large, two-stage rocket that used a storable, hypergolic propellant combination: Unsymmetrical dimethylhydrazine (UDMH) as fuel and Nitrogen tetroxide (N2O4) as an oxidizer. This combination is toxic and less efficient than other propellants, but it has a significant military advantage: it can be stored at room temperature for long periods, allowing a missile to be kept in a ready-to-launch state.

This propellant choice, made for military reasons in the 1970s, would define the entire “first generation” of Long March rockets and would be used for nearly half a century.

The Long March 2: The ICBM Mainstay

By adapting the DF-5 ICBM for orbital launches, China created its first true workhorse: the Long March 2 (CZ-2). The initial version, the CZ-2A, failed on its maiden flight in 1974. Engineers quickly identified and fixed the problem, and the CZ-2C variant, which flew a year later, began a streak of successful launches.

The primary mission for the CZ-2C was not communications or science. It was military reconnaissance. The rocket was the designated launcher for the Fanhui Shi Weixing (FSW), or “Recoverable Satellite.” These were essentially orbital spy cameras. The FSW satellite would orbit for several days, taking high-resolution photographs, and then release a reentry capsule that would be recovered on land. This program not only gave China its own Earth-imaging intelligence but also provided invaluable experience in mastering atmospheric reentry and parachute-landing systems – technologies that would one day be used to bring its astronauts, or taikonauts, safely back to Earth.

The Long March 2 family grew. The CZ-2D was developed as another variant, primarily launching from the Taiyuan Satellite Launch Center into polar orbits. But the CZ-2’s basic design, a two-stage rocket for low-Earth orbit (LEO), had its limits. The next great challenge was to reach the high-altitude orbits used by communications satellites.

Reaching for the Heavens: The Long March 3

A communications satellite intended to serve a specific region must be in a geostationary orbit (GEO). This is a very high orbit over 35,000 kilometers above the equator, where a satellite’s orbital period exactly matches the Earth’s rotation, making it appear stationary in the sky.

Reaching this orbit is energy-intensive. It can’t be done with simple hypergolic propellants. It requires the most powerful chemical propulsion available: liquid hydrogen (LH2) as fuel and liquid oxygen (LOX) as an oxidizer. This cryogenic combination is extremely efficient but also incredibly difficult to handle. Liquid hydrogen must be stored at temperatures near absolute zero, is prone to leaking, and the engineering to build reliable, restartable cryogenic engines is a massive technological hurdle.

In the late 1970s, China’s engineers began developing their own cryogenic third stage, the H-8. This was a remarkable leap, mastering a technology that only the US (with the Centaur stage) and Europe (with the Ariane rocket) had developed.

By adding this new cryogenic third stage to the core of a Long March 2, the Long March 3 (CZ-3) was born. After a partial failure on its first flight in 1984, the CZ-3 successfully placed China’s first experimental communications satellite, the DFH-2, into a geosynchronous transfer orbit (GTO).

With the Long March 3, China now had a rocket capable of launching the large communications satellites that were driving a global telecommunications boom. This opened the door to a new ambition: entering the international launch market. In 1990, a Long March 3 successfully launched the AsiaSat 1 satellite for a Hong Kong-based consortium, marking China’s arrival as a commercial launch provider.

Crisis and Consolidation: The 1990s

The 1990s began with great promise. To boost its payload capacity and compete directly with Europe’s Arianespace and American rockets, the China Academy of Launch Vehicle Technology (CALT) developed the Long March 2E (CZ-2E). This rocket took the CZ-2 core and strapped four large liquid-fueled boosters to its sides, dramatically increasing its thrust. This “booster” concept was a new design for China.

At the same time, the Shanghai Academy of Spaceflight Technology (SAST) was developing its own rocket family, the Long March 4 (CZ-4). This rocket specialized in launching satellites into Sun-synchronous orbits (SSO), a specific type of polar orbit ideal for weather (Fengyun) and Earth observation (Yaogan) satellites.

With the CZ-2 for LEO, the CZ-3 for GTO, and the CZ-4 for SSO, China had a versatile and growing fleet. But this period of rapid expansion soon led to disaster.

A String of Devastating Failures

The early 1990s were marked by a series of high-profile launch failures that shook the Chinese space program to its core.

• 1992 (CZ-2E): The launch of the Optus-B2 satellite for Australia. A fault caused one of the new strap-on boosters to shut down prematurely, and the rocket’s self-destruct system was triggered, destroying the rocket and payload.
• 1995 (CZ-2E): The launch of the Apstar-2 satellite. Just 51 seconds after liftoff, the rocket and its payload exploded in a massive fireball. The investigation pointed to high-altitude winds shearing the rocket.
• 1996 (CZ-3B): This was the most catastrophic failure. The maiden flight of the new Long March 3B, the most powerful rocket in the fleet (using the CZ-2E’s boosted core with the CZ-3’s cryogenic third stage), was carrying the Intelsat 708 satellite. Immediately after liftoff from the Xichang Satellite Launch Center, the rocket veered sharply off course, flew almost horizontally, and slammed into a nearby village. The official report stated six deaths, but unofficial estimates were much higher. The cause was traced to a single failed solder joint in the inertial guidance system.

In just a few years, China’s reputation for reliability was shattered. The program was in crisis, and the commercial launch business evaporated.

The Cox Report and ITAR

The fallout was not just technical; it was political. American satellite manufacturers, like Hughes and Loral, had participated in the post-failure investigations to determine what had happened to their payloads.

In 1998, a US Congressional investigation, known as the Cox Report, alleged that these companies had improperly shared sensitive technical information with their Chinese counterparts. The report claimed this assistance had helped China improve the reliability of its rockets and, by extension, its ICBM fleet.

The political backlash was swift. The US government re-classified commercial satellites as “munitions” and placed them under the control of the International Traffic in Arms Regulations (ITAR). This regulation effectively forbade any satellite with US-made components – which included almost every commercial satellite in the world – from being launched on a Chinese rocket.

In an instant, China was locked out of the international launch market. This blockade, intended to isolate China, had a significant, long-term effect: it forced China to become completely self-sufficient. If it couldn’t launch foreign satellites, it would build its own. This led to the development of the high-powered DFH-4satellite bus and other domestic platforms. It also forced the state-owned contractor, the China Aerospace Science and Technology Corporation (CASC), to embark on a ruthless top-down quality control and reliability campaign, known as the “Double-Eight” standard, to ensure no launch ever failed for a simple, preventable reason again.

The 1990s were a trial by fire. The program emerged smaller, quieter, and internally focused, but with a new, hardened emphasis on methodical engineering and “zero defect” reliability.

Project 921: The Path to Human Spaceflight

While the commercial program was in crisis, a far more ambitious project was quietly moving forward. In 1992, China’s leadership had approved “Project 921,” the goal of which was to put a Chinese astronaut into orbit.

This required a rocket of unprecedented reliability. No existing Long March was suitable; a standard rocket might have a 95% success rate, but for human spaceflight, the standard had to be closer to 99.9%.

The Man-Rated Machine: Long March 2F

Engineers took their most powerful and proven design, the Long March 2E (with its four boosters), and subjected it to an exhaustive “man-rating” process. The result was the Long March 2F (CZ-2F).

“Man-rating” involved upgrading virtually every system. The CZ-2F included redundant computers, fault-detection systems, and healthier safety margins on all components. Its most visible feature was a needle-like launch escape system (LES) mounted on top of the payload fairing. In the event of a catastrophic failure on the pad or during ascent, this tower of solid-propellant rockets would ignite, pulling the crew capsule (the Shenzhou) away from the exploding rocket to safety. The CZ-2F was also designed to fly “cleaner,” with smoother acceleration and vibration dampening for the crew’s comfort.

It was, in effect, a new rocket, and it was to be used for only one purpose: launching the Shenzhou spacecraft.

Shenzhou and the Taikonauts

From 1999 to 2002, the Long March 2F flew four uncrewed test missions, Shenzhou 1 through Shenzhou 4, proving the reliability of both the rocket and the new spacecraft.

The moment came on October 15, 2003. A Long March 2F rocket stood on the pad at Jiuquan, its white paint and red lettering gleaming. Inside the Shenzhou 5 capsule sat Yang Liwei, a former fighter pilot. The rocket ignited and climbed flawlessly into the sky. After 21 hours and 14 orbits, Yang Liwei returned safely to Earth, landing on the plains of Inner Mongolia. China had become only the third nation in history to independently send a human into space.

The Long March 2F became the backbone of China’s human spaceflight program. It launched every subsequent taikonaut crew: the first multi-person crew on Shenzhou 6 (2005), the first spacewalk on Shenzhou 7 (2008), and the missions to dock with China’s first prototype space laboratories, Tiangong-1 and Tiangong-2.

The CZ-2F holds a perfect flight record. It is the prestige rocket of the fleet, a symbol of the program’s methodical, state-driven success.

The New Generation: Cleaner, Stronger, Modular

By the early 2000s, CASC faced a strategic problem. The legacy Long March 2, 3, and 4 rockets had served China well, but they were based on 1970s technology. Their toxic hypergolic propellants were hazardous to launch crews, environmentally damaging, and left inland villages (where the launch centers at Xichang, Taiyuan, and Jiuquan were located) at risk from falling boosters. The rockets also weren’t powerful enough for China’s next-generation ambitions: a permanent space station and robotic missions to the Moon and Mars.

A decision was made to start fresh. A “New Generation” of rockets would be developed. They would be modular, more powerful, and would use cleaner, more efficient propellants:

• Kerosene (RP-1) and Liquid Oxygen (LOX): For booster and first-stage engines.
• Liquid Hydrogen (LH2) and Liquid Oxygen (LOX): For high-energy upper stages and core stages.

Developing the engines for this new fleet was the most difficult part. This effort produced two landmark engines:

1. YF-100: A powerful, high-pressure staged-combustion kerolox engine. This complex engine design is extremely efficient and serves as the workhorse for the new boosters and medium-lift rockets.
2. YF-77: A large, gimbaling cryogenic (hydrolox) engine, far more powerful than the H-8 engine used on the Long March 3.

These two engines became the building blocks for an entire new family of launchers, which would all be launched from a new, modern, coastal spaceport: the Wenchang Spacecraft Launch Site on Hainan Island. Its coastal location meant boosters would fall harmlessly into the sea.

The Heavy-Lift King: Long March 5

The centerpiece of the new fleet is the Long March 5 (CZ-5). This is China’s first true heavy-lift rocket, capable of placing 25 tonnes into LEO or 8 tonnes on a trajectory to the Moon.

It’s a modular giant. Its 5-meter-diameter core stage is powered by two YF-77 cryogenic engines. Strapped to its sides are four 3.35-meter-diameter boosters, each powered by two YF-100 kerolox engines.

The CZ-5 is essential for China’s most ambitious projects. Its development was not smooth. Its maiden flight in 2016 was a partial success. Its second flight, in 2017, was a catastrophic failure. The rocket lost thrust just minutes into its flight and fell into the ocean. The program was grounded.

The investigation traced the failure to a design flaw in the YF-77’s high-speed turbopump. It took CASC over two years – a 900-day investigation – to redesign, rebuild, and test the engine. This delay brought China’s entire deep-space program to a halt.

In December 2019, the “Return to Flight” mission of the CZ-5 was a success. The program was back on track, and the rocket quickly proved its worth.

• 2020: A Long March 5 launched Tianwen-1, China’s ambitious Mars mission that included an orbiter, lander, and rover, all in one.
• 2020: A Long March 5 launched the Chang’e 5 lunar mission, which successfully landed on the Moon, collected samples, and returned them to Earth.
• 2021: A Long March 5B (a variant with a massive fairing and no second stage, designed for LEO) launched the Tianhe, the 22-tonne core module and living quarters for the permanent Tiangong space station. It later launched the Wentian and Mengtian science modules to complete the station.

The Long March 5 is the linchpin of China’s 21st-century space aspirations.

The New Workhorses: Long March 6, 7, and 8

The new engines also populated a family of smaller rockets.

The Long March 7 (CZ-7) is the new medium-lift workhorse. It’s designed to replace the aging, hypergolic Long March 2. Its core stage is powered by YF-100 engines, and it can fly with or without strap-on boosters. Its primary, repeating mission is to launch the Tianzhou cargo resupply spacecraft to the Tiangong space station. It is the Tiangong’s freight truck.

The Long March 6 (CZ-6) is a light-lift rocket designed for the small satellite market. Its first stage is a single YF-100 engine. It is a small, versatile launcher, specializing in placing multiple satellites at once into Sun-synchronous orbits.

The Long March 8 (CZ-8) is one of the newest variants. It combines a CZ-7 core with CZ-3 boosters, designed to be a commercially competitive rocket for the GTO and SSO markets. Its most important feature is that it’s designed to be reusable. CASC is using the CZ-8 as a testbed for developing the vertical takeoff, vertical landing (VTVL) technologies pioneered by SpaceX’s Falcon 9.

The Quick-Response Rocket: Long March 11

While the new-generation rockets moved to liquid fuels, CASC also developed a new solid-propellant rocket: the Long March 11 (CZ-11). Derived from a military missile, the CZ-11 is a “quick-response” launcher. It can be stored for long periods and launched on very short notice from a simple transporter-erector-launcher (TEL) vehicle.

Significantly, the CZ-11 can also be launched from the sea. It is loaded onto a large, converted barge (the De Fu 15002), sailed to a precise location in the Yellow Sea, and launched. This flexibility allows China to launch into any orbital inclination without an overflight of foreign territory.

The Long March Families: A Comparison

The extensive history of the Long March series can be broadly divided into the “Legacy” hypergolic rockets and the “New Generation” kerolox/hydrolox rockets. This distinction represents the most significant technological shift in the program’s history.

A New Space Race: The Rise of Commercial Launch

For decades, CASC was the only game in town. It was a state-owned monopoly that built, launched, and operated nearly all of China’s space assets. That landscape changed completely in 2014.

In a landmark policy shift known as “Document 60,” the Chinese government actively encouraged private capital to enter the aerospace industry. The goal was to replicate the “NewSpace” boom seen in the United States, fostering innovation, driving down costs, and building a new commercial ecosystem to compete on the global stage.

The result was an explosion of new rocket companies. By 2023, there were over 100 registered commercial aerospace companies in China.

The Solid-Fuel Pioneers

The first private companies to reach orbit did so with small, solid-propellant rockets, which are simpler and cheaper to develop than liquid-fueled ones.

• i-Space (Interstellar Glory): In July 2019, i-Space’s Hyperbola-1 rocket successfully reached orbit, making it the first private Chinese company to do so.
• Galactic Energy: This company emerged as the most reliable of the early players. Its Ceres-1 solid rocket has compiled a string of consecutive launch successes, carving out a strong business in the small-satellite launch market.
• CAS Space: A spin-off from the state-owned Chinese Academy of Sciences (CAS), this company blurred the line between state and private. Its Lijian-1 (or ZK-1A) rocket is the most powerful solid-fueled rocket in China, capable of launching over 2 tonnes to LEO.

The Liquid-Fuel Frontier

The real prize is a reusable, liquid-fueled rocket. This is the technology needed to build large satellite constellations, like Starlink, and to truly compete with SpaceX. Several companies are in a fierce race.

Space Pioneer (Tianbing Aerospace): In April 2023, Space Pioneer’s Tianlong-2 rocket successfully reached orbit. This was a major milestone, marking the first time a private Chinese company succeeded on the first attempt with a liquid-fueled rocket (using kerolox).

LandSpace: This company focused on the next great technological leap: methane-liquid oxygen (methalox) engines. Methane is more efficient than kerosene, burns cleaner (leaving less soot), and is easier to handle than liquid hydrogen, making it the ideal fuel for a reusable rocket. After a narrow failure on its first launch, LandSpace’s Zhuque-2 (ZQ-2) rocket successfully reached orbit in July 2023. This was a world-first: the first methalox rocket from any company, anywhere, to successfully reach orbit, beating its American rivals (SpaceX’s Starship, ULA’s Vulcan, and Relativity’s Terran 1) to that specific milestone.

This new ecosystem is now a core part of China’s space strategy. CASC focuses on the large, national-prestige missions (the space station, deep space), while the private sector is encouraged to innovate rapidly, build satellite constellations, and drive down the cost of access to space.

The Future: The Moon and Beyond

China’s ambitions continue to grow, and they require rockets that do not yet exist. The national program has two clear goals for the 2030s: land taikonauts on the Moon and build a super-heavy-lift rocket for permanent lunar bases and deep-space exploration.

Long March 10: The Crew Launcher

To meet the 2030 lunar landing goal, CASC is developing the Long March 10 (CZ-10), also known as the CZ-5DY. This rocket is effectively a new heavy-lift design based on the proven YF-100 kerolox engines. It features a 5-meter core stage and two boosters, each with seven engines.

The lunar landing architecture is similar to the Apollo program but requires two launches. One Long March 10 will launch the lunar lander into lunar orbit. A second will launch the crew in a new-generation “Mengzhou” spacecraft. The two vehicles will rendezvous in lunar orbit, two taikonauts will descend to the surface, and they will later rejoin the mothership for the return to Earth.

Long March 9: The Super-Heavy Monster

The long-term vision requires a “super-heavy” launcher, a rocket on the scale of the American Saturn V or the Space Launch System (SLS). This is the Long March 9 (CZ-9).

The design for the CZ-9 has evolved significantly. Early concepts showed a traditional rocket with a large core and four massive strap-on boosters. However, in recent years, influenced by the rapid progress of SpaceX’s Starship, the design has shifted. The latest concepts show a massive, single-core rocket with no boosters, powered by a new generation of advanced methalox engines. The design’s goal is to be fully reusable. This rocket would be capable of launching over 150 tonnes to LEO or 50 tonnes to the Moon, enabling the construction of large-scale infrastructure in space, permanent lunar bases, and ambitious crewed missions to Mars.

Summary

The history of China’s launch vehicles is a direct reflection of its national journey. It began in the 1950s with borrowed technology and a desperate push for military self-reliance, culminating in the symbolic launch of the Long March 1. The program then methodically built its capabilities with the workhorse Long March 2, 3, and 4 families, establishing a foothold in low-Earth, geosynchronous, and polar orbits.

A period of crisis in the 1990s, marked by disastrous failures and a US-led technology blockade, forced the program to turn inward, forging a culture of extreme reliability. This new culture enabled the program’s greatest triumph: the perfect record of the Long March 2F and the success of the Shenzhou human spaceflight program.

Today, China’s space program is in the midst of its most dynamic era. The “New Generation” of Long March 5, 6, 7, and 8 rockets, based on cleaner and more powerful engines, has enabled the construction of the Tiangong space station and a series of stunning deep-space missions to the Moon and Mars. Simultaneously, a new generation of private companies, like LandSpace and Galactic Energy, has broken the state’s monopoly, introducing fierce competition and accelerating innovation in reusable and methalox-based rockets.

From the simple DF-5 missile to the planned, reusable super-heavy Long March 9, China’s rockets have carried the nation from a position of technological isolation to the front rank of space-faring powers.