本文对新发现的李煦信札《虚白斋尺牍》的基本情况进行了介绍,从多方面对其真实性进行考证,认为《虚白斋尺牍》是近年来发现的规模最大、最有价值的曹学资料,对研究曹家家世、李煦及其家族与《红楼梦》的关系意义重大,对推动清代政治史、社会史研究也具有重要的参考价值。 This article introduces the basic situation of the newly discovered Li Xu’s Letters of Unbelievableness and Whiteness, and carries on the research to its authenticity in many aspects. It considers that “the imaginary name” is the largest and most valuable found in recent years The data of Cao Xue is of great significance to the study of the relationship between Cao Jiajia and Li Xu and their clan and the “Dream of Red Mansions”. It also has important reference value for promoting the study of political history and social history in Qing Dynasty.