In order to understand the response of strong motion at the ground landfill in Tokyo Bay area, we conducted a seismic response analysis of a wide area. The area is a reclaimed land in Tokyo Bay, and it was modeled by three-dimensional FEM over 100m depth 8km north-south east-west 10km. Alluvium was expressed by the non-linear model. In the results of the displacement distribution and acceleration distribution, we found that there is a strong correlation with the alluvium base contour and buried valley.