Evaluation of soil response which is required to estimate potential building damage caused by excavations mainly depends on Finite Element Method (FEM) now. Using proper soil parameters is a key ingredient for FEM to compute soil responses, assuming the model represents the actual soil response in a reasonable way. Inverse analysis is a quantitative technique which allows one to select parameters to fit the responses of soil from field observations. The technique is applied to results of field performance data collected from an excavation made through Chicago clays. Results of computed soil responses based on the hardening soil model with small strain stiffness (HSS) found in the computer code PLAXIS are used to find the attenuation law of the soil movement induced by excavations. Difference cases are studied to find the parameters for the equations of the attenuation law of the soil movements. Coupling with empirical methods for the wall deformations and ground settlements, a simplified method for three dimensional soil movements induced by excavation is proposed. The method is verified through comparison with FEM.