Economic disparity is a huge global issue nowadays which threatens the economic justice and thus in some sense decides the fate of human being,especially those from developing countries.This essay analyzes economic disparity by using Geographic Luck and Dependency Theory.None of the two theories could explain the economic disparity individually.China,Britain and Iran are used as three examples to support the thesis. Economic disparity is a huge global issue nowadays that threatens the fate of human being, especially those from developing countries. This essay offers economic disparity by using Geographic Luck and Dependency Theory. One of the two theories could explain the economic disparity individually. China, Britain and Iran are used as three examples to support the thesis.