摘要
The role of the grammatical metaphor （GM） theory to systemic-functional linguistics （SFL） as well as to metaphor studies has been generally acknowledged. Based on the framework of GM theory in SFL, this thesis, by conducting a statistical analysis of the distribution of 13 types of GM in 20 English for science and technology （EST） texts which are chosen at random and aimed at different readers, is intended, on the one hand, to test and verify the applicability and feasibility of Halliday＇s grammatical metaphor theory as well as the correctness of Halliday-Martin＇s claim and on the other, to analyze the reasons for using GM, especially experiential GM substantially in EST texts.
