 Pei Songzhi cites Xi Zuochi repeatedly in his Annotations to Records of the Three Kingdoms, even preferring his account of certain events over historically closer records.However, he also accuses Xi Zuochi of forging a letter from Wang Ling to his nephew Linghu Yu (), basing his suspicions on the letter's style and language, as well as the fact that Xi Zuochi's work alone out of all his sources carried the text.In a separate account, Pei Songzhi cites an episode from Xi Zuochi's "Records of the Elders of Xiangyang", about Xiangyang native Dong Hui assisting Fei Yi in a difficult diplomatic encounter with Sun Quan, and subsequently being appointed to the chancellery staff of Zhuge Liang and made grand administrator of Ba commandery.