The Book of Songs is a book of propriety passing on rites and teaching people by the form of poetry with unique logic and rhetoric.Guan Juis the most typical poem deducing the propriety of humans from the laws of nature,which is acceptable,convinced and obeyed by the people naturally,friendly and eloquently. Therefore,the logic and rhetoric in The Book of Songs can be reconciled and self-consistent in the poetic thinking of the unity of heaven and humans.