Abstract: Based on the theoretical analysis, a method to optimize the design of circular strut system in deep excavations is proposed. A FEM program based on the model is developed. By comparing the calculate results, some optimized design parameters are obtained. The proposed method is used to analyze a deep excavation in Shaoxing. The analytical results are compared with the measured data. It is indicated that the suggested method can be used to simulate the excavation process of similar excavations. The circular strut system is an effective way in some deep excavations with special space.