以韩礼德系统功能语法为理论依据,从语气系统和情态系统两方面对中美两国领导人对同一事件所做的政治演说进行比较研究,旨在分析中英文政治演说中人际功能实现形式的异同,从而探讨人际交流相关功能。 Based on Halliday’s system functional grammar, the author compares the political speeches made by the leaders of China and the United States on the same event from both the tone system and the modality system to analyze the similarities and differences in the forms of interpersonal functions in the political speeches between China and the United States , To explore the interpersonal communication related functions.