The Three Gorges Project (TGP) is the greatest water conservancy engineering being built in the world. Each of the technical design and the engineering constuction in the project can be a worldwide key technical difficult and a representative case of water conservancy engineering.

Based on the overall examination of the Three Gorges Project navigation construction technical design, which started in 1994, the following 6 topics are described and discussed： 1) the general layout of the TGP navigation construction; 2) lock´s filling and emptying system and the lock´s hydraulics; 3) the design of the high slope of the permanent ship lock; 4) the hydro-structure of the permanent ship lock; 5) shiplift; 6) scientific research and its achievement during the technical design stage.