Since the 1940s, Chinese scholars have published numerous general works in the field of Sui and Tang history research, such as the works of Cen Zhongmian, Lv Simian, Han Hanban, Wang Zhongluo, Tang Changru, Huang Yongnian, etc., which have become essential classics in this field. In the Western academic community, there are two representative works: "Cambridge History of China" and "Harvard History of China". Cambridge History of Sui and Tang Dynasties and Harvard History of China: Tang Dynasty were published in 1979 and 2009 respectively, showcasing different academic characteristics. Cambridge History of Sui and Tang Dynasties represents the research strategy of "historical criticism", while Harvard History of China: Tang Dynasty embodies the research method of "historical expansion".

1、 The Critique Practice of Historical Materials in the Cambridge History of Sui and Tang Dynasties in China

In depth exploration of the practice of historical criticism in the Cambridge History of Sui and Tang Dynasties in China, it is pointed out that historical research relies on various historical materials, including handed down documents, unearthed documents, and foreign literature. Although "Cambridge History of Sui and Tang Dynasties in China" mainly focuses on handed down documents, it reinterprets and evaluates traditional historical materials through the method of historical criticism. The methods of historical criticism include examining the authenticity of the content of historical materials, reviewing the formation and nature of historical materials, etc., in order to reflect history more truthfully. In "Cambridge History of Sui and Tang Dynasties in China," Cui Ruide reveals the limitations of official historical records through tracing historical sources and critical spirit, such as insufficient historical materials, single discourse types, and being influenced by the author's political stance and personal prejudices. The Cambridge History of Sui and Tang in China adopts two strategies when reinterpreting historical figures, systems, and events: one is to understand the role of Confucianism in the compilation of historical records, starting from specific historical facts and adopting different value standards; The second is to observe personnel in the historical context of the time, revealing different aspects. Through these methods, "Cambridge History of Sui and Tang Dynasties in China" enriches the understanding of Tang history and provides new research perspectives and methods for the field of medieval history.

2、 Harvard History of China: The Tang Dynasty and Methods for Expanding Historical Materials

The Harvard History of China: The Tang Dynasty demonstrates expandability in the use of historical materials, not only focusing on traditional historical books, but also extensively collecting other materials to supplement the shortcomings of official history. With the deepening of historical research, new fields such as social history, material history, knowledge history, and intellectual history continue to emerge, and the demand for diversified historical materials is increasing day by day. The book has limited space in political history and explores more topics such as geographical environment, daily life, foreign relations, family society, and religious beliefs, reflecting the transformation of academic atmosphere.