However, the analyses of written texts are generally limited, up to now, to the topic meaning on surface level.

It exists in the whole process of spoken language communication, and plays a role of supplement or even substitution in defining, reinforcing or differentiating the utterance meaning, and interpreting the mood and occasion.

Intentions are one of important aspects of utterance meaning.

It points out that dynamic semantics pays much attention to utterance meaning and that the basic concept of dynamic semantics,"informational states",should be understood carefully.

In addition,it s the basis and core of speech meaning.

From the viewpoint of cognitive processing,language meaning is deposited as knowledge in the long-term memory,however,speech meaning is constructed temporarily in short-term memory.

The construction of speech meaning is a hot topic in the studies of linguistics and lingo-philosophy.

Cultural schemata,as some knowledge structures in people s mind,play an important role in the process of understanding discourse meanings.

This paper not only introduces the context theory and analyzes the differences between the sentence meaning and discourse meaning, but also particularly discusses different discourse meanings in different contexts for students to get a correct understanding with the aid of context information.