Abstract: In the Qianlong(乾隆)year 57,Cheng Weiyuan(程伟元)and Kao O(高鹗)reversed,organized and republished 《The Dream of Red Mansions》ChengⅡ(程乙本).in compare with the copy editions,from the characteristic of the title label on cover,first and last pages,preface,picture,catalogue,to the text,it shows that these two ChengⅡ(程乙本)editions,collected by BNU Library and Cultural Relics Bureau of Shaoxing,are well preserved and earlier published editions as far as we know.Currently visible ChengⅡ(程乙本),which is first published in the Qianlong year 57,lacks page 12 in chapter 47,and the edition in BNU Library is supplemented with two pages of Pavilion Dongguan Version of the Jiaqing(嘉庆)year 16 with comments.However,the edition of Tianjin Library didn't lack of the same page,we found that,the page is same with ChengⅠ's .In addition,ChengⅡ(程乙本)editions of BNU Library and Tianjin Library were the first editions,published in 1792 by Cuiwen Bookstore(萃文书屋),according to lack of page,typeface,ink leakage.To some extent,editions of Tianjin library and Cultural Relics Bureau of Shaoxing have the trace of adjusting wood movable type,showing the feature of revising ChengⅡ(程乙本).As a result,in compare with ChengⅠ(程甲本),and three kinds of A,B,and C with ChengⅡ(程乙本),both of contents of ChengⅠ(程甲本)and ChengⅡ(程乙本)lie in the edition of Shanghai Library,and it showed independent characteristic to some extent,This edition could belong to Cheng Ⅲ(程丙本)properly.

Key words: The Dream of Red Mansions, ChengⅡ of BNU Library, Cheng Ⅱ of Cultural Relics Bureau of Shaoxing, ChengⅡ of Tianjin Library, photograph printing of original edition