Abstract: The cross-linguistic studies at home and abroad have made a lot of achievements from various perspectives. Grammatical metonymy (GM) has been a new trend in conceptual metonymy in recent years, which will open up a new avenue of research in cross-linguistic studies. This paper first illustrates the theoretical foundation of the cross-linguistic study of GM. Based on the previous studies on GM, the paper explores its research scope in line with morphology and syntax and generalizes its research content.