In the Paleolithic Age, men lived on fishery and hunting, and were sheltered in trees and caves. In the Neolithic Age, men engaged in raising animals and farming, and settled down by digging caves and by building simple houses with twigs and lumber, thus commencing their architectural activities.
During the 3,000 years of the feudalist society, Chinese ancient architecture formulated gradually its unique system, coupled with a considerable progress in urban planning, garden designing, and house construction technique. In 221 B.C., the First Emperor of the Qin Empire mobilized the resources of the country to do construction works on a massive scale, including A'Fang Palace, the Emperor's Mausoleum, the Great Wall and the Dujiangyan Water-Conservancy Project. From then on, many more massive construction works of lasting fame were carried out in the history of China.