Enlightened by phraseology theory of corpus linguistics, this study adopts an automatic retrieval of 4-word-bundles from a 210,000-word EFL teacher-talk database which was collected before and after the EFL education reform starting in 2001. Analysis is made on bundles with high frequency in terms of form, meaning and functional patterns, results of which are interpreted into teaching ideology renewal. It is found that teacher-talk in classes after the reform has greatly enhanced interaction between teachers and students, offering more guidance in students’ cognitive development and shifting teaching mode from prescriptive to explorative. Moreover, this methodology proves that recurrent lexical bundles in oral speech can be regarded as one mode of phrasal unit in corpus linguistic perspective, as they are patternized and meaningful in revealing user’s ideology.