Abstract：The Three Gorges Project(TGP) on the Yangtze River is the largest water resources project in the world. The ship lock of the TGP is schemed as a double-way and five-step continuous ship locks；it has the characteristic of large size and high water head；and the valid size of single-step lock is 280 m×34 m×5 m (length×width×minimum water depth). The ship lock of the TGP is the largest shiplock with highest design total water head in the world. The water level changes range within 135–175 m in up-stream，and within 62.0–73.8 m in down-stream. The design total water head is 113 m and maximum navigation discharge is 56 700 m3/s，through which ten-thousand-ton fleet can pass；and the annual one-way passage capacity is fifteen million tons. The design and research of the TGP initiated in 1950s；it was been construction commencement in April，1994，and it began tried navigation in June 2003. The ship lock of the TGP putting into operation is the synthetical research and applying consequence of many kinds of science and technology. Many technologies about the ship lock are acquired innovation and broke through by a series of science researches.
