The Three Gorges Project (TGP) is the largest project in China which is being under construction today. The permanent shiplock is located in left bank of the dam, and there ex st rock slopes with the maximum height more than 170 m which will be formed completely by rock cut in Tan Z ling mountain in left bank. There are more than 300 rock blocks appeared in the vertical wall of the rock slopes du ing the Shiplock Excavation. The TGP has a layout with an underground power house in capacity of 4,200 MW, which is located in the right bank of the dam, and it will be lately under construction after the completion of dam construction. With usage of block theory, this paper presents the stability analysis of rock blocks in the permanent shiplock and the underground powerhouse, and some improvements of Block Theory for its engineering applications have been studied.
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