The Great Wall is the symbol of China and is also one of the greatest structures in human history. The application of remote sensing technology to studying Great Wall is a new research field, which is obviously superior to traditional field investigation. The Great Wall is somewhat different in different areas in such aspects as building materials, spatial distribution and environment, and these differences are likely to be reflected in remote sensing images. In this paper, the Great Wall in Beijing and Yulin is comparatively studied by using high spatial resolution satellite images, and the causes for their differences are analyzed.