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This dissertation is to study chunking and boundary of a text in Modern Chinese. Starting from the process of a normal course comprehension about a text which is adopted by the speaker's top-down chunking processing strategy. The gist of the paper is to research the structure of a text.Chapterâ… is an introduction. It gave descriptions to subjects and scopes that are related to the dissertation, also research methodologies and corpus, the basic concepts and terminologies involved, as well as each chapter's arrangements.Chapterâ…¡discussed on chunkings and language comprehension. First of all, using the "top down" and"bottom up"as the key words making a brief review on the present research situation of this kind of text, also discussed the principles of cognitive chunking, then proposed to Text-based chunking analytic method based on texts top-down chunking processing.Chapterâ…¢inspected into chunking markers. In this chapter we discussed how to organize chunking according to structural relationships and semantic relationships in a text. i.e. trying to identify structural chunk out and cut them from a text. we analyzed chunking markers governing power. Above we inquired are on the basis of two perspectives of natural discourse and three levels of observation discourse, form as the standard, dividing chunking markers into two categories:independent types and appositive types.Chapterâ…£explored issues of chunkings'boundary. Proposed the structure-formed of the boundary, semantic mechanisms and principles of boundary-identified, discussed language means which are helpful when to identify a boundary, and inspected boundary-checking through questionnaires and other methods.Chapterâ…¤studied text chunking types. On the basis of chunking markers classification and boundary identification, focusing on basic types of chunking during chunking markers realization in a discourse turn:topic chunking, determinative chunking, dominant chunking, allegations of chunking; truth Conditions chunking marker; discourse marker chunking and meta-discourse marker chunking, and inquired into issues of chunking markers how to formed in cross-discourse turn.Chapter VI analyzed text hierarchy. From the point of properties of conductive force related to chunking markers governing force, investigated the nested relationships between the structural chunks, by deducing the high layer behavioral existence of a text, further explained the properties of hierarchy in a text overall structure.Chapter VII is the conclusion. It is the summary of this dissertation, which points out shortcomings existed in present research and issues needed to continue to investigate in order to further clarify and explain the level of the overall structure of a text.