The Sui Dynasty Reunifies China and Digs the Grand Canal
After nearly four centuries of division, one ruler puts China back together
Quick facts
- Reunification
- 589 CE
- Founder
- Yang Jian (Emperor Wen of Sui)
- Grand Canal completed
- 605 CE
- Capital
- Chang'an
What happened
Yang Jian seized power from his base in Guanzhong, unified northern China by 581 CE as Emperor Wen of Sui, and then turned south, assembling an army of more than half a million troops and a fleet that included five-decked ships capable of carrying 800 men. Sailing down the Yangtze River, his forces captured Nanjing within three months, and by 589 CE the last southern holdout had fallen, ending nearly four centuries of division since the Han collapse and making China a single state again with its capital at Chang'an. The Sui government pushed the repair and expansion of existing canal systems into what became the Grand Canal, whose main course, completed in 605 CE by linking several older canal sections, moved grain from the fertile lower Yangtze valley north to the capital region near Luoyang.
Why it matters
Sui reunification ended the longest period of political division in early Chinese history and set the administrative and territorial template the following Tang dynasty inherited directly. The Grand Canal solved a persistent geographic problem, China's richest farmland and its political capitals sat on different river systems, by physically connecting the Yangtze and Yellow River basins, and the canal remained in continuous use for over a thousand years afterward.
How we know
The Sui reunification campaign and canal construction are described in official Sui and Tang dynastic histories; the Grand Canal itself survives as a physical structure still partly navigable today, documented by engineering surveys of its route and locks.
Sources
- World History Encyclopedia. Sui Dynasty · Reputable sourceworldhistory.org · The domain "worldhistory.org" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
- Asia for Educators, Columbia University. Arteries of Empire · Reputable sourceafe.easia.columbia.edu · The domain "afe.easia.columbia.edu" is on our Reputable source registry. · Link is live and its text matches the event's key terms (Jul 2026)
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