Abstract: This paper illustrates the reasons that couplets integrated into landscape architecture, introduces expression methods and roles of couplets in landscape architecture. The aesthetic perception and expression function of couplets are basic reasons that couplets integrate into landscape architecture, and are accordant with the pursuit of landscape architecture to landscape and ideological level. Emperors and literati promoted the progress that couplets integrate into landscape architecture. Human implication of landscape architecture is revealed and deepened by couplets through methods of taking advantage of a scene to express emotion and describing a scene with sentiment that one himself feels and understands it.