Generic intertextuality (Textsortenintertextualität) is an essential aspect of discourse genre (Textsorten) research. It not only casts aside the limitation that textual intertextuality barely focuses on the intertextual relationship between content and form but also reveals the procedural synchronic and diachronic relationship between genres. This paper adopts the model proposed by German scholars Klein and Janich to analyze the generic intertextuality of court judgments. By revealing how genres in the legal field cooperate to complete judgments in the communicative task process. It is proved that generic intertextuality is of significant reference to the expansion of genres and intertextuality research.