China’s Marine Engineering Construction Adds 211 Billion Yuan in 2025

What changed

China’s marine engineering construction industry generated 211 billion yuan in added value in 2025, up 0.3% from a year earlier, according to a development brief released during the 2026 Xiamen International Ocean Week.

The sector’s weight is heavily concentrated in four coastal provinces:

• Zhejiang, Shandong, Fujian and Jiangsu produced about 159.7 billion yuan, or roughly 76% of the national total.
• Zhejiang and Shandong each exceeded 45 billion yuan, together accounting for more than 45% of the total.

The year also brought more than 30 offshore oil-and-gas jacket installations, offshore wind additions up more than 60%, and the completion of the Shantou Bay subsea high-speed-rail tunnel.

Why it matters

The headline growth is modest. The underlying shift is more substantial: China’s marine construction industry is putting more emphasis on domestic equipment, greener energy and complex offshore infrastructure.

That shows up in the spread of projects. Offshore wind is moving farther into deep water. Tidal-energy development is advancing from megawatt demonstrations toward 100-megawatt-scale use. A nuclear-power seawater cooling application also reached a technical breakthrough.

The geography matters too. Four provinces account for about three-quarters of the industry’s added value, making them the main base for China’s marine construction capacity. The report says Chinese capabilities in cross-sea bridges and tunnels, offshore wind, ports and nearshore oil-and-gas development have entered the world’s leading group.

The industry’s next test is whether that technical momentum can keep producing growth while marine ecological protection remains part of the plan. The 2025 figures show where China’s marine-engineering strength is concentrated and which technologies are advancing; they do not yet show what 2026 investment, profits, employment or environmental effects will look like.