《水浒传》里的武松,因报兄仇犯下杀人之罪,按当时大宋刑律当斩。然而,他最终逍遥法外。古往今来,杀人偿命是天经地义,更何况连杀两人。从这一层面讲,武松无疑是幸运的。本文拟从批评语言学的角度,分析该案文书的语篇分析,解析其逍遥法外的原因。 “Water Margin” in the Wu Song, reported revenge for murder, according to the criminal law when the big cut. However, he eventually went unpunished. Throughout the ages, it is perfectly justifiable to kill people, not to mention killing two people. From this level, Wu Song is undoubtedly lucky. This article intends to analyze the discourse analysis of the case instrument from the perspective of critical linguistics and analyze the reasons for its impunity.