Introduction to the cultural layer: In places where humans live or have fixed activities, a "cooked soil layer" is usually accumulated on the natural "raw soil", which is called the "cultural layer", which is mixed with traces of human life and activities. . If undisturbed, later layers will always overlap earlier layers. Archaeological excavations follow this rule and reveal the stratigraphic structure in an orderly manner from late to early. Conduct research based on excavated materials. The history of the site can be recreated. The cultural layer of the Banpo site contains the accumulation of remnants of people's lives in four stages.