It was fired from a ship in Yellow Sea
China launched a space rocket from sea for the first time, the latest step in Beijing’s push to become a major space power. China now spends more than Russia and Japan on its civil and military space programmes — unveiling ambitious plans for missions to the moon and beyond in the coming decade.

China’s achievements in Space Programme
1. A Long March 11 rocket was launched from a ship in the Yellow Sea. With sea launch, China now has the ability to deploy satellites from a mobile platform.
2. Earlier this year, China became the first nation to land a rover on the far side of the moon.
3. It also unveiled ambitious plans to build a research base on the lunar surface, send a probe to Mars and build a space station in Earth orbit. In 2003, China became only the third nation to have the capability of launching humans into space.

Most recently, Russian-backed firm Sea Launch used a floating platform to launch dozens of rockets between 1999 and 2014.

Benefits of launching satellites from Sea
Launching from sea has a number of advantages, such as the ability to send off rockets from a variety of locations on Earth, as well as reduced costs and risks.

(Source:https://www.thehindu.com/sci-tech/science/china-launches-its-first-sea-based-space-rocket/article27527177.ece)