Filial piety as an ethical concept was formally put forward in the Western Zhou Dynasty. In the Western Zhou Dynasty, filial piety means:
First, respect our ancestors. The main way of filial piety is sacrifice. In the ancestral hall, ancestor worship is a sacrifice, and the object of filial piety is the dead, which has a certain religious form.
Second, carry on the family line. In the eyes of Zhou people, ancestors are the product of our generation's life. Therefore, ancestor worship is to continue the life of ancestors. In a word, filial piety in the Western Zhou Dynasty is a feudal religious ethics.