Abstract:The Yangtze Three Gorges Project (TGP) is the key backbone project to develop and harness the Yangtze River in China. As the largest water conservancy project in the world with the earth and rock excavation amounting up to 102.83 million m3,it is,therefore,the largest project in scale of geoengineering. The involvement of numerous domestic and foreign research institutions in the scientific research for TGP construction has promoted the development of geo-mechanics. Some geomechanics problems arising during construction of TGP are discussed in this article.