This article is a comprehensive study of Ts'ui Shu (1740-1840), a Confucian classical scholar largely unrecognized by his contemporaries. It takes its topic from the reexamination of Ts'ui Shu's intellectual positioning in the Ch'ing Confucian studies. The article begins by identifying Ts'ui's criticism of the School of Mind-and-Heart and his inclination toward historical inquiry. Then it goes on to explore Ts'ui Shu's relations with Chu Hsi's learning, emphasizing Ts'ui's link with the tradition of intellectualism in Confucianism. The author compares Ts'ui Shu's scholarship with the Ch'ing dynasty's Han-learning scholars. Finally, he discusses where Ts'ui Shu fit into the intellectual sectarianism of Ch'ing Confucian learning. By drawing upon a variety of related texts, an attempt is made to demonstrate the complexity and diversity of the development of Ch'ing Confucianism and show how Ts'ui Shu's scholarship takes a unique position in both values it promotes and its overall significance within the broader context of the multiform Confucian tradition. Seen in this manner, Ts'ui Shu's voice, in speaking to scholars of later generations, is both unconventional and yet must still be considered a legitimate member of its own time and heritage.