袁枚致李宪乔的信为《随园诗话》最早版本的刊刻时间提供了有力佐证;刘墉致刘墫的信是了解清代科举制度的第一手资料;周永年致李宪暠的信对研究山东高密诗派的交游情况有帮助;吴大徵致祁世长的信是当时清流派人物的处境和心态的真实反映。 Yuan Mei Zhi Li Xianqiao’s letter as the “edition of the poem” the earliest version of the publication time provides a powerful evidence; Liu Yong’s letter to Liu Xie is the first-hand information to understand the Qing imperial examination system; Zhou Yongnian to Li Xianhao letter to study Shandong Gaomi poetry It is helpful for the faction’s exchange of visits; the letter sent by Wu Da-zheng to Qi Shi-chang is a true reflection of the current situation and mentality of the Qing-generationists at that time.