Earthquake loading poses a significant challenge for building foundations. Pile groups and piled raft foundations are becoming more commonly used to support structures built on weak or challenging soil conditions. Pile groups, consisting of multiple piles working together, enhance bearing capacity and improve stability. Piled raft foundations combine a pile group with a raft footing, offering a cost-effective solution when dealing with moderate bearing capacity soils and potential for settlement. This study examines how pile diameter, pile length, and raft thickness influence the overall deformation of piled raft foundations using the finite element analysis software ANSYS. The findings indicate that increasing any of these parameters reduces total deformation, highlighting the importance of optimizing foundation element dimensions to minimize settlement in piled raft systems. Additionally, the research investigates how different configurations of pile groups and piled raft foundations affect their seismic performance. Specifically, it explores how variations in pile diameter, length, and raft thickness impact the behavior of these systems under earthquake loads. Understanding these factors enables engineers to design more robust foundations for structures in seismically active regions.