It is a kind of important means to get together Chinese nation's centripetal force to offer a sacrifice to an ancestor. " week gift " is said, " left grandfather's right society ", have shown people's attention to the ancestral temple of a ruling , ancestor for week. This kind of intense emotion permeates in the poem of offering a sacrifice to an ancestor of " the Book of Songs " too. Offering a sacrifice to an ancestor in " the Book of Songs " is in the poem, embodying a concentrated reflection of the later generation descendants will worship, express the strong hope that the hope ancestor lower the good fortune to the sincerity of ancestor's contribution, this is undoubtedly the form of expression that a ancestor worships. The gift exists in the era of " the Book of Songs " objectively, the gift that the ancestor worships the condensed outside form that comes out to offer a sacrifice to an ancestor. Can see , " the Book of Songs " one has offered a sacrifice to an ancestor and reflected the content of gift of offering a sacrifice to an ancestor of the objective reality at that time in the poem, the concrete appearance festival displaying the gift of offering a sacrifice to an ancestor, have represented the grand occasion of making culture of gift at that time . Therefore, the poem of offering a sacrifice to an ancestor in " the Book of Songs ", know the ancient gift of offering a sacrifice to an ancestor to us more objectively, and have important value to understand " the Book of Songs " under the background of the gift. The research of the gift that this text and offers a sacrifice to an ancestor to " the Book of Songs ", focus on the contents of three respects mainly: First part Intension and " the Book of Songs " to probe into " offer a sacrifice to an ancestor " offer a sacrifice to an ancestor table of contents of poem. The scholars define more confused to the poem of offering a sacrifice to an ancestor and page purpose , the characteristic of the poem and meaning offering a sacrifice to an ancestor that " the Book of Songs " of the foundation of this text offers a sacrifice to an ancestor, proceed from content and function of " the Book of Songs " poem, has asserted the relevant poems of offering a sacrifice to an ancestor of the gift with offer a sacrifice to an ancestor in " the Book of Songs ". Second part The gift reflects the basic content in " the Book of Songs " to probe into and offer a sacrifice to an ancestor. The gift is divided into and often offers sacriffices to the gods or the spirits of the dead and holds a memorial ceremony for and informs temporarily to offer a sacrifice to an ancestor. This text combine gift book and other document, to offer a sacrifice to an ancestor gift is it know again to go on , according to offer a sacrifice to an ancestor system and content of gift is it criticize of a text " the Book of Songs " offer a sacrifice to an ancestor purport of poem to go, behavior that the gift system offers a sacrifice to an ancestor in the poem in " the Book of Songs " by investigating and offering a sacrifice to an ancestor. The third part Combine " the Book of Songs " probe into routine offer a sacrifice to an ancestor course on the whole of etiquette. The emperor duke under an emperor of " appearance gift " offer a sacrifice to an ancestor gift lack , and some of " the Book of Songs " offer a sacrifice to an ancestor poem chapter in artistic form, offered a sacrifice to an ancestor to the duke under an emperor of the emperoring, the etiquette has described, have offered the capsule information for the thing that we investigate the original appearance of the gift that the duke under an emperor of the emperor offered a sacrifice to an ancestor at that time. The understanding of etiquette of offering a sacrifice to an ancestor relevantly through reflecting to " the Book of Songs " of this text, regard " the Book of Songs " as the main target , documents , such as " Book of Rites " , " week gift " joined ,etc., and the content that " gift of the appearance " can be drawn lessons from , course on the whole of the gift that the duke under an emperor offers a sacrifice to an ancestor to probe into the emperor. Keyword: Offer a sacrifice to an ancestor; ?E; ?; Taste; ; Corpse ; Sort out and hold a memorial ceremony for