History of Imperial China, published by Harvard University Press in the United States, and A History of China, published by Kodansha in Japan, are significant works on Chinese general history abroad. Due to differing perspectives and temporal and spatial contexts, these works exhibit distinct narrative styles and characteristics for the same historical period. This article compares the narrative variances between the Tang History Volume of History of Imperial China and A History of China, aiming to elucidate the underlying reasons for such disparities. Analysis reveals that the primary distinction between these two historical works lies in their overarching focus: while History of Imperial China adopts a global perspective, examining the evolution of China's imperial system, the volume China's Cosmopolitan Empire: The Tang Dynasty (History of Imperial China, Vol. III) delves into the shifts and adaptations of the Chinese imperial system during the Tang Dynasty. Conversely, each volume of A History of China boasts unique attributes, with Brilliant World Empires: The Sui and Tang Dynasties (A History of China, Vol. VI) adopting an East Asian perspective to scrutinize the Tang Dynasty's impact as a global empire. This article posits that the disparities in overall structure and specific content between the two works stem from several factors, including publishing objectives and target audiences, the scholarly traditions of Chinese history research in the United States and Japan, the historical relationship between respective countries and China during the Tang Dynasty, as well as the research fields and propositions of the authors.