Because the doors can protect people, gradually people thought doors might have godheads. We can find some neolithic monuments concerning the belief in door gods. Since Sung dynasty, the ceremony of door gods has came into being form. The Zhou dynasty, the form of the belief in door gods has been subsumed into common beliefs. After the Hang dynasty, people have personalized door gods. After all, charms and gatepost couplets replace the position of door gods.