Abstract: In different times,emphasis is laid on different feature of language,which is considered to be most important and typical.However,as for language use and teaching,it is necessary to advocate the "Interdisciplinary".For instance,we can compare human language with other human communicative systems or non-human communicative systems,just as what I am trying to do.I'm trying to figure out some problems in language teaching,through comparing pragmatics and discourse analysis with foreign language teaching.