This paper focuses on the theoretical and methodological issues in the study of East Asian Sinographic texts. Previous research has generally followed four basic models: the “Sinocentric perspective,†“influence studies,†the “challenge-response theory,†and the “internal development theory.†These models reflect nineteenth- and twentieth-century modes of thought, but their limitations have become increasingly evident today. In response, the author proposes the concept of the “Sinographic Cultural Sphere as Method,†which emphasizes viewing East Asian Sinographic texts as an integrated whole while recognizing both differences within similarities and similarities within differences. This approach seeks to move beyond the dichotomy of center and periphery, advocating for multidirectional book circulation and mutual interaction. In the era of globalization, research on East Asian Sinographic texts should focus on identifying commonalities through particularities, thereby contributing to cultural exchange, integration, and the development of East Asian scholarship in the 21st century.