Abstract: This paper deals with the main problems on fast pre-construction geological forecasting of shiplock high slope rock mass in Three Gorges Project.The necessarity and technical method for fast pre-construction geological forecasting of shiplock high slope rock mass are studied in the paper.The back analysis and progressive design of shiplock slope are illustacted according to the results of fast pre-construction geological forecasting by the author.Finally,the pre-control measures for slope rock mass is analysied.