Abstract：The main research achievements are summarized of the displacement back analysis for the permanent shiplock slope of the Three Gorges Project during its excavations of stage 1 and 2，from 1994 to 2000. The deformation mechanism and its numerical modeling of rock slopes are presented. For the back analysis of rock slope，theoretical research is important，however for engineering application, more attention should be paid to the investigation of its macro-deformation mechanism and numerical modeling technique. For the blocky rock masses of the permanent shiplock slope，their deformation is primarily composed of that of its disturbed zone，and it is feasible to model the deformation behavior of the disturbed zone by taking it as a weakened linear-elastic material.
