Shi Pi Pan Shu was an outcome of the internal polemics of Chinese Marxist historiography in the 1930 s to 1940 s. Around 1944, Guo Moruo learned in quick succession about the research findings of Jian Bozan, Fan Wenlan, Hou Wailu and other Marxist historians on ancient Chinese history. They reiterated their scholarly differences with Guo and developed further scholarly criticism, but paid little attention to the fact that Guo had updated or revised his old doctrine. As a result, Guo rekindled his passion for writing, engaging in polemics in the form of ‘self-criticism’ or ‘implicit criticism’, which was compiled into Shi Pi Pan Shu. The debate focused on the nature of Shang and Zhou societies and the class attributes of Confucianism and Mohism, involving such issues as the staging of ancient history and ancient forms of land ownership. It also extended to the modern times ranging from the argumentation on the social history of the 1920 s to 1930 s, to the Five Golden Flowers studies of the 1950 s to 1960 s. As one of the main accomplishments of the polemics, Shi Pi Pan Shu remains an essential historical literature for the study of the Marxist historiography.