Abstract
As the ancestral rites is one of ritural ceremony in our country it's tradition have performed to-day. The purpose of this research of this research is to study both filial piety as a thought of worshipping ancestors and the traditional ancestral ceremony through examinition of 「kyung-mong-yokyul」provide the basic materials for the practice of the filial piety and contribute to the morals of life and the culture of home life in nodern society. Also through it's litereture it is to research the forms of ancestral ceremony (time place, memorial dress, foods, etc) in the traditional society and the responsibility of acting ancestral rites at home life. According to 「kyung-mong-yokyul」on ancestral rites it stressed on the true heart rather than unrational materialistic courtesy. And the ancestral rites in the family system of traditional socity was the most important things in among practices at home especially the host(the eldest son and the eldest daughter in family) who hol this ceremony played a important roles.