Modeling of dynamic soil-foundation-structure interaction considering superstructure flexibility in Various soil/foundation conditions using analytical/numerical approach is presented. The effect of Superstructure flexibility on the response of the foundation when excited by different earthquakes is studied Here. Initially, the foundation alone is considered, and its response is calculated. The foundation is then Analyzed by lumping the total mass of the superstructure on the foundation – the same manner in which the Foundation is generally analyzed for practical purposes. Different superstructures are then considered with Varying flexibilities and the foundation is analyzed by considering the soil-foundation-structure interaction. The effect of soil stiffness on the response of the foundation is also investigated. Various types of soil are Considered by varying their shear wave velocity and the response is calculated. The response of the model Under combined sliding and rocking modes is analyzed. It is found from the analyses that the displacements In the foundation are highly influenced by the presence of a flexible superstructure. The translational Displacement reduces when the superstructure is flexible, however the rotational displacement is Substantially higher. The spectrum of natural frequency is also affected by the flexibility of superstructure. The foundation soil type has significant influence on the fundamental period of the soil-foundation-structure System.