Abstract：There are many factors affecting the retaining structure of deep foundation pit，and more and more retaining types of retaining schemes have been devised. The whole retaining system is an aggregate that contains many factors. So it is very necessary to make the optimum design. The whole retaining system is divided into some corresponding subsystems，and the optimum analysis procedure of retaining system for deep foundation pit is designed by virtue of the optimum theory. The computer analog system of the optimum analysis is developed and its stability and validity are verified by analyzing engineering example.
