Abstract: In the study of natural language processing, in general, semantic processing is within a certain number of low-level primitives selected, with the structural organization of these primitives to solve the high-level semantics of term, and these semantic primitives need to be clear, this would solve a range of semantic issues.Actually, it is only a certain range instead of the grammatical structure of semantic, does not really solve the problem of semantic expression.With some progress made in the research of artificial intelligence, computer from a simple numerical calculation into knowledge processing stage.Agent theory helps to use from the perspective of the nature of language to deal with natural language processing in artificial intelligence framework, for the semantic analysis provides the horizon of philosophy and methods of analysis.