This paper,starting from the analysis of the concept of context,putsforward three functions of context in understanding the text,namely,reference assignment,disambiguation and pragmatic enrichment.

The present paper, borrowing ideas from transformational generative grammar and componential analysis, gives a tentative definition of ambiguity, analyzes the various factors causing ambiguity, and proposes ideas concerning disambiguation.

Relevance theory proposed by Sperber & Wilson provides us with an excellent theoretical framework for disambiguation.

Study on an improved ambiguity elimination algorithm of Chinese text segmentation;

The present paper attempts to explore that in different texts reiteration demonstrates the functions as follows:ambiguity elimination function, topic foregrounding function,emotional function and interpersonal function, etc.